while引导句子句子为一般进行时?= =
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while引导句子句子为一般进行时?= =
while引导句子句子为一般进行时?= =
while引导句子句子为一般进行时?= =
是的,谓语动词要用现在进行时.
e.g.While I was reading the book,my mother came.