单项选择题

—That professor often joins in different activities in Beijing. Do you know ______
—For 5 years.

A. how long she has stayed there
B. when she went there
C. when will she come there
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单项选择题
A. B. C.
单项选择题
The students ______ having dinners in the school dining hall.
A. used to
B. are used to
C. uses to
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