It was quite a long time      I made it out what had happened.
A．a(chǎn)fterB．beforeC．whenD．since
B
“It + be + 時間名詞+before / since”從句句型中，連詞before  與since 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，其句間是“自從……以來已經(jīng)多久了”，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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