赞题库-背景图

单项选择题

（）my return, I learned that Professor Smith had been at the Museum and would not be back for several hours.

A. At
B. On
C. With
D. During

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热门试题

单项选择题7（）

A.work
B.do
C.follow
D.obey

单项选择题6（）

A.but
B.while
C.therefore
D.as