单项选择题

In their letter to the students' representative assembly, the freshmen insisted on in the Student Union.（）

A. represented
B. being represented
C. having represented
D. have been represented

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单项选择题
The high income tax is harmful （） it may discourage people from trying to earn more.

A. in that
B. that
C. in which
D. which
单项选择题
Researchers at the University of Illinois determined that the （） of a father can help improve a child's grades

A. involvement
B. communication
C. interaction
D. association
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