单项选择题

Floods have undermined the foundation of the ancient bridge.

A. destroyed
B. reached
C. broaden
D. covered
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I finally submit my report before the deadline.
A. hand in
B. hand out
C. hand on
D. hand back
单项选择题
The compulsory courses refer to those that you have to take.
A. simple
B. voluntary
C. practical
D. required
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