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主语+[ ]+动词ing
人气:406 ℃ 时间:2020-03-22 10:35:36
解答
主语+[ am/ is /a re ]+动词ing构成现在进行时如:What are you doing I am listening to the radio.主语+[ was / were ]+动词ing构成过去进行时如:I was doing my homework when my mother arrived home yesterday...
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