单项选择题

People appreciate （） with him because he has a good sense of humor.

A. to work
B. to have worked
C. working
D. having worked

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单项选择题
The last half of the nineteenth century （） the steady improvement in the means of travel.

A. has witnessed
B. was witnessed
C. witnessed
D. is witnessed
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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