to do 这个不定式中的do 是及物动词 how 是疑问副词, 能做宾语吗? 显然不能, 故排除C 选项 how to do 的后面有个宾语it, 成分便没残缺 B 中的what 是代词, 除非do 的后面没宾语it, 如果是what we should do 就行D 项...
we can not work out the physics problem.Can you tell us ____
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