单项选择题

（）we have finished the course, we shall start doing more revision work.

A. For now
B. Now that
C. Ever since
D. By now

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单项选择题

A.as poor, if not poorer than, his sister
B.poor as his sister' s if not poorer
C. as poor as, if not poorer than, his sister' s
D. as poor, if not poorer than, his sister' s

单项选择题

（）one of the subjects that appeal to many university students.

A. Economics is
B. Economice is
C. Economics are
D. Economics have been