—Where is that report?
—I brought it to you you were in Mr. Black’s office yesterday.
A. if
B. because
C. when
D. before
网友回答
A. if
B. because
(答案→)C. when
D. before
解析：词义辨析题。A. if 如果 B. because 因为C. when 当…时候 D. before 以前 句意：“那份报告在哪？”“昨天当你在布莱克先生的办公室的时候我把它给你带来了。”根据语境选C