摘要：Aeclipse of the sun is a rare.when we may not see each other clearly for a short time in the daytime.
网址：http://m.1010jiajiao.com/timu3_id_3025294[举报]
_____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