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While He Yan was at the doctor's,I was going to the class.wh

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While He Yan was at the doctor's,I was going to the class.while引导的从句是用进行时,这里用的却是过去时?
While He Yan was at the doctor's,I was going to the class.wh
while引导的状语从句强调的是两件事情的同时性.这里while接的不是动作,而是be动词加介词表状态,无法用进行时.没有规定说while引导的状语从句一定要接表动作的词,所以也不一定要用进行时.He Yan在医生那里的那段时间内,我正在去上课的路上.