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
疑問詞后接動詞不定式。句意“我們不能算出這個物理難題，你能告訴我們怎樣算出來”，what可作為do的賓語，how不可作為do的賓語，因此后需加代詞it，因此選C。
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