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She asked him ___he was sure his mother _______.为什么是IF和WOULD

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She asked him ___he was sure his mother _______.为什么是IF和WOULD COME 不能WETHER,WI...
She asked him ___he was sure his mother _______.为什么是IF和WOULD COME 不能WETHER,WILL COME求解释.
She asked him ___he was sure his mother _______.为什么是IF和WOULD
if和wether虽然都有是否的意思,但是if还在虚拟语气中使用.
不过我觉得这题的重点不是if和wether,第一个空两个词都可以填,但第二个空要和前面的时态保持一致,所以用的是would而不是will.