单项选择题

They didn't realize how serious the problem was.

A．know
B．forget
C．doubt
D．remember
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单项选择题
The soldier displayed remarkable courage in the battle.
A．placed
B．showed
C．pointed
D．decided
单项选择题
There are only five minutes left, but the outcome of the match is still in doubt.
A．result
B．judgement
C．estimation
D．event
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