While you are doing math exercise, put a calculator(计算器) ____ to help you. A．in hand B．at hand C．by ...
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题目内容：
While you are doing math exercise, put a
calculator(计算器)
____ to help you.
|
A．in hand
|
B．at hand
|
C．by hand
|
D．on the hand
|
本题链接：
