单项选择题

There are some differences between the two. I really don't know ______.

A．where to choose
B．which to choose
C．to choose what
D．to choose which
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单项选择题
Don't get ______ . Everything will be all right.
A．excited
B．exciting
C．to excited
D．in exciting
单项选择题
I tried to persuade her to stop crying but ______ had no effect.
A．I
B．which
C．one
D．it
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