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问题: 用express的适当形式填空

Unable to tell the differences between the two ( ),the teacher ( ) regret and at the same time an embarrassed (   ) appeared on his face.

解答:

expressions,名词,表达方式,因为有TWO,所以复数
expressed 动词,表示,与后面的appeared 一样的时态
expression 名词,表情