【題目】He is really nervous. He ______back and forth all the night waiting for the results.

A. has been walking B. had walked

C. walked D. is walking

【答案】A

【解析】

試題分析：本句的時間狀語是all the night整個晚上。句意：他真的很緊張，整個晚上她一直走來走去在等待結(jié)果�，F(xiàn)在完成進行時表示動作的持續(xù)性和反復(fù)性。故A正確。

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