单项选择题

All the staff members of the department made ______ efforts to clean up the hall for the Christmas party.

A. gigantic
B. cohesive
C. comprehensive
D. conscientious
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单项选择题
Before the first non-stop flight made in 1949, it ______necessary for all planes to land for refueling.
A. would be
B. has been
C. had been
D. would have been
单项选择题
Jimmy couldn’t' t eat hard food for at least half a week as he had his wisdom tooth ______ today.
A. pulled
B. fragmented
C. extracted
D. picked
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