单项选择题

The course normally attracts 20 students per year, （） up to half will be from overseas.

A. in which
B. for whom
C. with which
D. of whom

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单项选择题
（） his return from Japan, Prof. Li went directly to his laboratory and started working with his colleagues.

A. Upon
B. At
C. Within
D. Over
单项选择题
The goals （） he had fought all his life no longer seemed important to him.

A. after which
B. for which
C. with which
D. at which
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