【題目】I don't know_______ now.

A. how to do B how to do it C. what to do D. B and C

【答案】D

【解析】句意：現(xiàn)在我不知道怎么辦。作為動詞know的賓語，用疑問詞+to do，動詞do后面缺少賓語，用疑問詞what充當(dāng)；用疑問詞how時，動詞do后面有賓語it。故選D。

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