Since the world heritage list was first created in 1972, many more sites _____ it.

A. have added up to
B. are added to
C. have been added up to
D. will be added up to
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科目：高中英語 來源：0110 期中題 題型：單選題

Since the world heritage list was first created in 1972, many more sites _____ it.
[     ]
A. have added up to
B. are added to
C. have been added up to
D. will be added up to

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科目：高中英語 來源： 題型：

Since the world heritage list was first created in 1972,many more sites          it.

A.have added up to                            B.are added to

C.have been added up to                     D.will be added up to

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