It was quite a long time__________I made it out what had happened.?
A．a(chǎn)fterB．beforeC．whenD．since
B?
在“It+be+時間名詞+before/since”從句句型中，連詞before與since極易混淆。用before引導(dǎo)時，句意是“過了多久才……”，主句中的be動詞為過去時或?qū)頃r態(tài)；用since引導(dǎo)時，其句意是“自從……以來已經(jīng)很久了”，主句中的be動詞多為現(xiàn)在時（或現(xiàn)在完成時）或一般過去時（此時since從句要用過去完成時）。?
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