【題目】He should brush his teeth before ______ to bed .

A. goB. goingC. to goD. went

【答案】B

【解析】

句意：在睡覺前他應(yīng)該刷牙。根據(jù)before介詞，后用動名詞doing形式；go動詞原形，going動名詞或現(xiàn)在分詞，to go不定式，went過去式；故選B。

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