问题
选择题
All flights ___ because of the storm, they had to wait in the hall. [ ]
A. have put off
B. were put off
C. have been put off
D. having been put off
答案
答案：D
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All flights ___ because of the storm, they had to wait in the hall. [ ]
A. have put off
B. were put off
C. have been put off
D. having been put off
答案：D