摘要：Of particular interest to visitors the large number of bookstores that sell books in different languages. A. have been B. are C. were D. is
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_____finish their task ahead of time, the students worked harder and harder
- A.In order to
- B.So as to
- C.As to
- D.In order not to
Scientist are not sure about the ___________ of water on the Mars
- A.occupation
- B.existence
- C.demand
- D.treasure