We can't work out the physics problem.Can you tell us-------

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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）

这个句子可以是Can you tell us how to do it?或者是Can you tell us what to do?
how是状语,是连词,conj.所以它不能做动词的宾语.如果用how,do后面一定要接宾语it,how表示怎么做；
what可以代替物,做动词的宾语,所以可以直接说what to do.
再问：不好意思，我想问一下为什么不能做宾语就要加it
再答：额……这个句子主谓宾肯定不能少啊，如果how不作宾语就缺少宾语，所以用it

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