It was quite a long time______I recognized him.

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问题 It was quite a long time______I recognized him.

选项 A、after
B、before
C、when
D、since

答案B

解析 “It+be+时间名词+before/since’’从句句型中,连词before与since容易混淆。用 before引导时,句意是“过了多久才……”,主句中的be动词为过去时或将来时态;用since引导时,其句意是“自从……以来已经多久了”,主句中的be动词多为现在时(或现在完成时)或一般过去时(此时since从句要用过去完成时)。
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