She hesitated for moment before stepping through the doorway,before后为什么是现在分词?
人气：292 ℃ 时间：2020-05-25 20:17:19
解答
She hesitated for moment before stepping through the doorway
因为【before】是介词,后面应该用动名词的形式,所以用ing形式
她在进走廊之前犹豫了一下
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