单项选择题

Young children soon _______ words they hear their elders use.

A．put forward
B．mm up
C．pick up
D．use up
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单项选择题
I doubt whether he can _______ his efforts much longer as he looks very tired.
A．keep up
B．keep on
C．keep in
D．keep at
单项选择题
Supposing you were asked to study a second foreign language _______
A．what your choice will be
B．what would be your choice
C．what will be your choice
D．what your choice would be
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