There are still many problems______before we are ready for a long stay on the Moon.

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问题 There are still many problems______before we are ready for a long stay on the Moon.

选项 A、solving
B、to solve
C、being solved
D、to be solved

答案D

解析句意：准备在月球上长期生活之前，我们还有很多问题要解决。本题考查非谓语动词中的动词不定式作表语表示将来时态，且problems和solve之间构成了逻辑上的被动关系，只有D项符合题意，故答案选D。

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中学英语

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