单项选择题

He is ______ a history student at Harvard University.

A. in time
B. at present
C. at a time
D. at once
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单项选择题
I find great ______ in her improvement.
A. satisfy
B. satisfied
C. satisfying
D. satisfaction
单项选择题
Jim, like the rest of the students in the class, usually ______ to school on time.
A. comes
B. come
C. are coming
D. has come
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