题目内容

【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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