____ has recently been done to provide more buses for the pe

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____ has recently been done to provide more buses for the people……
1.____ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
A. That B. What C. In spite of what D. Though what
为什么选C,不选D?
2.This problem may lead to more serious ones if ____ unsolved.
A. making B. remained C. keeping D. left
为什么选D,不选B或C?
B C 不可以表状态么？

1.though一般引导句子.
2.if left unsolved 省略了一些成分,完整的应该是if it(this problem) is left unsolved.是被动形式.如果用remain是某事或某物保持某状态,用主动语态,所以要用也是remaining.keep的话应该是这个问题被保持未解决状态,要用被动,kept.

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