only when they were told of the importance of time ____ wasting time is equal to wasting part of their life.A.did those boys realize B.had those boys realized why not

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only when they were told of the importance of time ____ wasting time is equal to wasting part of their life.
A.did those boys realize
B.had those boys realized
why not

b过去完成时,比过去更过去.when引导的从句是过去时,空后面主句的时态在从句发生后才发生.若选b,时间关系上就不对.

这是倒装句还原后就知道了用完成式为什么不行?过去完成时指过去的过去如果这里把had改为have可以吗?先把倒装改回来the boys realised ....when..你不会用have realized吧就是用have realized持续到现在吗?有影响吗?那为何用完成时持续到现在啊realize 瞬间完成啊不可持续...

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这是倒装句

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应该是A过去式,用不着完成时态

A