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
When the heat accumulates in the room, it will become so hot().

A.elects
B. collects
C. selects
D. reflects
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