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        1. 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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