--- Where's that report?--- I brought it to you you were in Mr. Black's
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--- Where's that report?
--- I brought it to you ________ you were in Mr. Black's of-fice yesterday.
A.if
B.when
C.because
D.before
试题答案
B
句意："那篇报告在哪儿呢？""昨天当你在布莱克先生办公室的时候我带给你了"。when"当……时候"。