It was quite a long time ______ I figured out what had happened to the manager.
A．a(chǎn)fterB．beforeC．when 　　　　D．since
B

試題分析：句意：有很長(zhǎng)時(shí)間我才弄清經(jīng)理發(fā)生了什么。這句話用了固定句型：It was+一段時(shí)間+before+從句，表示“過(guò)了很長(zhǎng)時(shí)間才/就….”如果是It is+一段時(shí)間+since…，自從…有多久了，選B。
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