单项选择题

The boy always looks through his homework before handing it in.

A. write
B. does
C. finishes
D. examines
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A number of theories have been proposed to explain the situation.
A. suggested
B. tested
C. used
D. announced
单项选择题
Everybody was glad to see Mary back.()

A. sorry
B. sad
C. angry
D. happy
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