_ by his words,all the audience clapped now and then until his lecture came to an end.

题目

_ by his words,all the audience clapped now and then until his lecture came to an end.
A.Impressed B.To be impressed
选哪个?为什么?说一下具体原因

答案

选A,表示听众被他的话感动了而鼓掌,
B是不定式,表示目的,意义变为了观众为了被感动,与常理不服.
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