谓语动词多为进行时,或状态动词的一般时。while的这些用法可用when代替,等于“at the time that",“during the time that” 如:Please keep quiet while(when)others are studying. ⑵ ...
在由when, if, after, before, as, as soon as, the minute, the next time, in case, though, till, until, unless, so long as, where, whatever, whenever等引导的状语从句中,常用一...
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