单项选择题

I didn't know which was the better, so I took them______.

A．all
B．each
C．none
D．both
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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
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
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