大学英语大学英语大学英语四级(CET4)1999年1月大学英语四级(CET-4)真题试卷
题目内容

All flights ________ because of the snowstorm, many passengers could do nothing but take the train.

2024-07-09

A.had been canceled

B.have been canceled

C.were canceled

D.having been canceled

题目答案

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