—Where’s that report?
—I brought it to you _______ you were in Mr.Black’s office yesterday.
A.ifB.whenC.becauseD.before
B
when意為“當……時候”,既可表示某一點時間,也可以表示某一段時間。在when引導的時間狀語從句中,其謂語動詞可以是延續(xù)性的,也可以是非延續(xù)性的,可與主句中的謂語動詞同時發(fā)生,也可在其后發(fā)生。根據(jù)句意可判斷出表示“當我昨天在布萊克先生辦公室時,我把報告帶去了”。if引導條件狀語從句,意為“如果”。because引導原因狀語從句,意為“因為”。before引導時間狀語從句,意為“在……之前”。
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