It was quite a long time ________ I made it out what had happened.
A.a(chǎn)fterB.beforeC.whenD.since
B
選B!癐t + 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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