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
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