摘要：Of the two toys,the child chose . A.the less expensive one B.the one most expensive C.the least expensive D.the most expensive of them
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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