A. | solving | B. | solved | C. | being solved | D. | to be solved |
分析 句意:在我们准备在月球上长期生活之前,还有很多问题有待于解决.
解答 答案D.
分析句子结构可知,主句为"There are still many problems",空格之后的成分为非谓语动词形式.根据句意可知,很多问题还没有被解决,都是未来将要发生的事情,所以应该用不定式,从而排除A、B和C项.而这些问题又是要被解决的,所以用不定式的被动语态.这里用"to be solved"作"problem"的后置定语.可以转换成定语从句"…problems which are to be solved…",因此D项符合语境,故选D.
点评 本题考查非谓动词用法.解答此类题目首先要读懂句意分析句子结构,判断分词在句中所作的成分,若分词与所修饰的名词是主动关系则用doing,被动关系用done,表将来用to do.
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