【題目】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】

試題分析：考查現(xiàn)在完成進(jìn)行時(shí)。本句的時(shí)間狀語(yǔ)是all the night整個(gè)晚上�，F(xiàn)在完成進(jìn)行時(shí)表示動(dòng)作的持續(xù)性和反復(fù)性。句意：他真的很緊張，整個(gè)晚上他一直走來(lái)走去在等待結(jié)果。故選B。

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