问题
选择题
76. All flights _______ called off because of the terrible weather, they had to go there by train.
A．were
B．had been
C．being
D．having been
答案
答案：D
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76. All flights _______ called off because of the terrible weather, they had to go there by train.
A．were
B．had been
C．being
D．having been
答案：D