单项选择题

Next semester, Susan must take three compulsory courses.

A. formal
B. voluntary
C. practical
D. required
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单项选择题
The manager didn't have time so far to go into it in details, but he gave us a general ide
a.A. at lengthB. at handC. in summaryD. in turn
单项选择题
The two parties finally agreed to collaborate with each other.
A. operate
B. conduct
C. lead
D. cooperate
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