[题目]There are still many problems before we are ready for a long stay on the Moon.A. solving B. solved C. being solved D. to be solved 题目和参考答案——青夏教育精英家教网—

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【题目】There are still many problems ______ before we are ready for a long stay on the Moon.

A. solving

B. solved

C. being solved

D. to be solved

【答案】D

【解析】考查非谓语。非谓语的动作发生在谓语动词之后，所以要用to do，又因为非谓语的动作与逻辑主语many problems构成被动关系，所以选择to be solved。

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