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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onlywhentheyweretoldoftheimportanceoftime____wastingtimeisequaltowastingpartoftheirlife.A.didthosebo

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
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

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