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科目： 來源：四川省高考真題 題型：單選題

We laugh at jokes, but seldom _____ about how they work. 

[     ]

A. we think
B. think we
C. we do think
D. do we think

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科目： 來源：同步題 題型：單選題

I have been living in the United States for twenty years, but seldom _____ so lonely as
now.
[     ]
A. have I felt
B. I had felt
C. I have felt
D. had I felt

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科目： 來源：同步題 題型：單選題

So badly _____ in the car accident that he had to stay in hospital for several weeks.
[     ]
A. did he injure
B. he injured
C. was he injured
D. he was injured

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科目： 來源：同步題 題型：單選題

Only by introducing scientific management, I suppose, ________ our company to a bright future and
make more profits in the next years.
[    ]
A. can we bring  
B. we have brought
C. we can bring  
D. have we brought

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科目： 來源：同步題 題型：單選題

Only when ________ be possible to sign the papers.
[     ]
A. does the boss come will it
B. the boss comes will it
C. has the boss come it will
D. the boss comes it will

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科目： 來源：同步題 題型：單選題

To our surprise, not a single word ________ in the discussion last Friday.
[     ]
A. had the teacher said  
B. said the teacher
C. the teacher had said  
D. did the teacher say

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科目： 來源：同步題 題型：單選題

______ allow drugs to become uncontrolled in our district.
[      ]
A. In certain circumstances can we
B. In no circumstances we can
C. Under any circumstances we can
D. Under no circumstances can we

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科目： 來源：同步題 題型：單選題

We have to admit that never in the past twenty years ________ so greatly as before.
[     ]
A. did the city change  
B. the city has changed
C. has the city changed  
D. the city had changed

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科目： 來源：同步題 題型：單選題

Not until ________ the exam ________ the importance of doing homework.
[    ]
A. had he failed; he realized
B. he had failed; did he realize
C. he had failed; he realized
D. had he failed; did he realize

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科目： 來源：同步題 題型：單選題

Not until they left school ________ how much their teachers loved them and helped them.
[     ]
A. they realized  
B. had they realized
C. they would realize  
D. did they realize

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