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(shí)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(shí)，句意是“過了多久才……”，主句中的be動(dòng)詞為過去時(shí)或?qū)頃r(shí)態(tài)；用since引導(dǎo)時(shí)，其句意是“自從……以來已經(jīng)很久了”，主句中的be動(dòng)詞多為現(xiàn)在時(shí)（或現(xiàn)在完成時(shí)）或一般過去時(shí)（此時(shí)since從句要用過去完成時(shí)）。?
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