单项选择题

The repair work involved modifying two of the windows.

A. clearing
B. changing
C. mending
D. painting
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单项选择题
The conference explored the possibility of closer trade links.
A. rejected
B. investigated
C. proposed
D. postponed
单项选择题
When does the next train depart
A. pull up
B. pull down
C. pull out
D. pull in
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