By the time we got there,the meeting _____.A.was beginning B.had beganC.had already begun D.begun

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By the time we got there,the meeting _____.A.was beginning B.had beganC.had already begun D.begun

By the time we got there,the meeting _____.A.was beginning B.had beganC.had already begun D.begun
By the time we got there,the meeting _____.
A.was beginning B.had began
C.had already begun D.begun

By the time we got there,the meeting _____.A.was beginning B.had beganC.had already begun D.begun
C
by the time是明显的完成时的标志,从句中用的是got过去时,因此主句应该用过去完成时.只能在BC中选,但Bhad后的begin应该用过去分词形式,所以选C

C 过去完成时 (因为在到达之前发生的动作)

C. had already begun

选C
翻译:我们到那时,会议已经开始了。
从句中又By the time, 主句用完成时。
从句we got there,主句往前推一个时态——用过去完成时。