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问题: 语法问题:请分析!

____has recently been done to provide more buses for the people,a shortage of public vehicles in some area remains a serious problem.
A.That B.What C.In spite of what D.Though what
答案是C.可是D为什么不可以呢?

解答:

what has recently been done to provide more buses for the people。这句话中,what 引导的是一个名词性短语,而不是一个句子。though后面必须加一个句子,所以在这里不适用。

what在这里的用法类似于what to do这样。