Thiety years had passed----- he kenw itA.after B.when C.before D.while

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Thiety years had passed----- he kenw itA.after B.when C.before D.while
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Thiety years had passed----- he kenw itA.after B.when C.before D.while
Thiety years had passed----- he kenw it
A.after B.when C.before D.while

Thiety years had passed----- he kenw itA.after B.when C.before D.while
C

C....
在他知道前,30年已经过去了。。。
因为前面用的是过去完成时,所以选before...
如果用after...用过去时
Thirty years have passed after he knew it.
他知道后,又过了30年(意思也不一样)
其他两个更不对了