单项选择题

They will get the job done in ______ time.

A. three quarter of an hour
B. three quarters of an hour
C. three quarter of an hour’s
D. three quarters of an hour’s
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单项选择题
The president of the college, together with the deans, ______ a conference for the purpose of laying down certain regulations.
A. is planning


B. are planning
C. are to plan


D. have planned
单项选择题
The last half of the nineteenth century ______ the steady improvement in the means of travel.
A. has witnessed


B. was witnessed
C. witnessed


D. is witnessed
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