要联系上下文,如果说话者陈述的是过去发生的事,自然是用过去时,如果表述的是现在正在发生的事,就用现在进行时.大多数情况,这样的句子是表达过去发生的事,过去时会比较好.关键看上下文.
While he was writing on the blackboard,the children talked/w
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