单项选择题

Within 2 years, the turnout of this mobile phone manufacturing company increased ______.

A．ten fold
B．ten-fold
C．ten-time
D．ten-folds
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单项选择题
Try ______ the green button to see if the machine will start.
A．press
B．to press
C．pressing
D．to have pressed
单项选择题
I am glad you show my letters ______ in the family, for I like them all to know what I am doing, and I can't write to every one.
A．off
B．round
C．up
D．out
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