单项选择题

______ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.

A. Even if



B. As far as
C. If only



D. So long as
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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
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
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