There are still many problems ______ before we are ready for a long stay on the Moon.A.solvingB.solv

题目简介

There are still many problems ______ before we are ready for a long stay on the Moon.A.solvingB.solv

题目详情

There are still many problems ______ before we are ready for a long stay on the Moon.
A.solvingB.solved
C.being solvedD.to be solved
题型:单选题难度:中档来源:不详

答案

D

试题分析:本题考查非谓语动词,考查方式为非谓语动词形式选择。根据题干信息,非谓语动词在这里做定语,限定“要去解决的问题”。根据非谓语动词做定语的规则,现在分词表示主动和正在发生,过去分词表示被动或完成,而不定式表示将要发生,所以选D。

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