题目内容

【题目】He is really nervous. He ______ back and forth all the night waiting for the results.

A. had walked B. has been walking

C. walked D. is walking

【答案】B

【解析】

试题分析：考查现在完成进行时。本句的时间状语是all the night整个晚上。现在完成进行时表示动作的持续性和反复性。句意：他真的很紧张，整个晚上他一直走来走去在等待结果。故选B。

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