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only when they were told of the importance of time ____ wast

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/10 11:34:17
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
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.
再问: 如果这里把had改为have可以吗?
再答: 很不合适,only when 倒装句型主句从句时态一致。