Mother didn't leave until she saw her child ＿＿the street and

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Mother didn't leave until she saw her child ＿＿the street and ＿＿the school gate.
A.crossing;entering B.crossing;enter C.cross;entering D.cross;enter
最好能附上简短的解释

这道题主要考查实义动词的用法.
可以用排除法解题,根据and可以判断：saw右面跟的两个动词是平行关系,在时态上必须一致,因此排除B、C两项.
整个句子是not…until…结构,此结构通常用于一般时态(一般过去时、一般现在时、一般将来时).可以变为：Mother saw her child___ the street and ___the school gate,then she left.
动词+ing形式通常表示这个动作正在发生,是进行时态.但结合语境,原句属于一般过去时,saw和leave两个动作时承接关系.
因此D项正确.
译文:母亲直到看着孩子过街,走进校门,才离去.

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