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科目： 來源：不詳 題型：單選題

Earth is believed ______ by an object the size of Mars at some point in the distant past  
before its surface cooled．
A．to be hitB．to have hit C．to have been hitD．to hit

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科目： 來源：不詳 題型：單選題

---- Have you ever seen a dictionary ____________ our school library?
---- Yes, it is over there and Mary is using it.
A．belonging toB．belonged to
C．being belonged toD．belong to

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科目： 來源：不詳 題型：單選題

There are several factors _______ in the economy _______ make it difficult to predict the future.
A．operate; whereB．operating; whichC．to operate; thatD．operated; what

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科目： 來源：不詳 題型：單選題

______ a happy life, try to look at the positive side in every situation.
A．LivingB．To liveC．Having livedD．Live.

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科目： 來源：不詳 題型：單選題

Unfortunately, the element Madam Curie devoted all her life              her death.
A．to causedB．causingC．to be causedD．to causing

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科目： 來源：不詳 題型：單選題

When first __________ to the market, the computer software was not a success due to its complexity in operation.
A．introducingB．being introduced
C．introducedD．to be introduced

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科目： 來源：不詳 題型：單選題

It remains doubtful whether the project _____________ next month will bring profits to the company.
A．a(chǎn)ccomplishedB．to be accomplished
C．having accomplishedD．being accomplished

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科目： 來源：不詳 題型：單選題

Professor Smith, along with his assistants, ________ on the project day and night to meet the deadline.
A．workB．workingC．a(chǎn)re workingD．is working

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科目： 來源：不詳 題型：單選題

I prefer studying English at home         the match.
A．to watchingB．to watchC．rather than watchD．rather than watching

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科目： 來源：不詳 題型：單選題

We shouldn’t think barefoot running strange. It’s normal, fun and comfortable if _____ properly.
A．doingB．to doC．doneD．being done

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