Tom had to be told two or three times he could remember what the teacher said.A．beforeB．whenC．untilD．As 题目和参考答案——青夏教育精英家教网—

题目内容

23. Tom had to be told two or three times ________ he could remember what the teacher said.

A．before

B．when

C．until

D．As

23．A(解析：考查连词。before "到……为止；在……之前"when“当……时候"until"直到……为止”as“当……时候”，until强调动作的延续性，其中tell并非延续性动词，另根据句意“老师说两三遍之后汤姆才能记住。”因此选A。)

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