B
be动词+过去分词表被动
你看句中有by,一般有by就用被动.
不是所有有be动词的就是进行时
They were ( ) by Edison's thinking cap.A.inventing B.invented
They were ( ) by Edison's thinking cap.A.inventing B.invented
英语人气：161 ℃时间：2020-04-10 17:16:04
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