题目内容

It was quite a long time      I made it out what had happened.
A．afterB．beforeC．whenD．since
B
“It + be + 时间名词+before / since”从句句型中，连词before  与since 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，其句间是“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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