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几个英语问题,求解释~谢啦~

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几个英语问题,求解释~谢啦~
1:(whether) we can have clean drinking water lies in (what) effective measures will be taken by the government about water pollution .
第二个空(what)为什么不填that ,我不觉得这个句子缺少什么成分呀?这个what 在这里是起什么成分,具体~
2:If we ( ) she planned to go abroad today ,we would see her off at the airport at the moment.
A:knew B:had known C:have known D:would know
答案选B,求解释
3:I ( ) coming to vist you ,but I wonder when I can spare time with so much work to do.
A:had thought of B:thought of C:have been thinking of D:have thought of
答案选C,为什么不选D呢?
几个英语问题,求解释~谢啦~
A.第一步先判断这是两句主语从句合成句
1.whether在句首时,该句是一句主语从句,这是第一处
2.what引导的后半部分也是一句主语从句,这是第二处
如果用that,那前面应该要有一个形式宾语it
whether we can have clean drinking water lies in it that ……
比如:
It is true that he has……=That he has ……is true.
B.句子后半部分用了虚拟语气,说明事实恰恰相反,那时候我们根本没在机场遇见她
这里的虚拟是对过去的虚拟,因为我们没看见她是发生在过去的,那么if引导的从句部分时态要向前推一步,用过去完成时
C.题目打错了,不是when应该是whether
have been doing与have done的最大区别在于
前者是为了强调动作正在持续
题目翻译应该是:我一直想要拜访你,但我担心我有太多的工作要做而没有时间