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

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单项选择题
No sooner had the words been spoken than he（）that he was foolish.

A. realizes
B. had realized
C. realized
D. has realized
单项选择题
The world（）is made up of matter.

A. in that we live
B. on which we live
C. where we live in
D. we live in
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