When last ____valuable,those books enjoyed great success.A.finding B.found C.being found D.to be found

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Whenlast____valuable,thosebooksenjoyedgreatsuccess.A.findingB.foundC.beingfoundD.tobefoundWhenlast__

When last ____valuable,those books enjoyed great success.A.finding B.found C.being found D.to be found
When last ____valuable,those books enjoyed great success.
A.finding B.found C.being found D.to be found

When last ____valuable,those books enjoyed great success.A.finding B.found C.being found D.to be found
这道题目,我们要注意分析句子结构,主语是those books,所以这里逗号前面的应该用被动语态,A首先排除,而C是表示正在被发现,也不对,排除.D,这里只是表示一种状态,没必要用动词不定式,也排除,所以选B.
把句子换一种方式表达就是:When those books were last found valuable,those books enjoyed great success.这样你肯定能够看明白.