加过去式表示的是某个动作,加动名词表示保持一种状态
这里的动作只需保持一瞬,所以用过去式,但是要表示一个持续性动作就用动名词
具体运用要放在句子里看,进行比较
You must keep your eyes_____while the eraser is passing.A cl
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