单项选择题
Mr. White works with a chemicals import & export company, but he_________for this industrial fair, since he is on leave.
A．has worked
B．works
C．has been working
D．is working
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单项选择题
A．dealtB．facedC．copedD．greeted
A．dealt
B．faced
C．coped
D．greeted
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单项选择题
All flights ______ because of the terrible weather, they had to go there by train.
A．having been canceled
B．had been canceled
C．having canceled
D．were canceled
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