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We can't work out the physics problem. Can you tell us         ?
A.how to doB.what to do it
C.how to do itD.what should to do
C
疑问词后接动词不定式。句意“我们不能算出这个物理难题,你能告诉我们怎样算出来”,what可作为do的宾语,how不可作为do的宾语,因此后需加代词it,因此选C。
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