what we should do is 后面接什么 附加例句啊

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• what we should do is 后面接什么 附加例句啊
• We can't work out the physics problem.Can you tell us----------?A.how to do B.waht to do it C.how to do itD.what should to do 为什么不选A,看讲解是what可做do的宾语.how不可做do的宾语,因此需加代词it.（但是看不懂啊,为什么what可以而how就不行.为什么不行又必须加it）
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