单项选择题

The foreigner tried his best, but he still couldn't make his point______.

A．understand
B．understanding
C．to understand
D．understood
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单项选择题
The Smiths ______ their breakfast when the morning post came.
A．had
B．has been having
C．are having
D．were having
单项选择题
Burglars ______ and stole some money while the family was away.
A．broke up
B．came to
C．broke in
D．built up
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