单项选择题

Since Xerox couldn’t work smoothly, he assumed that someone had ______ with it.

A. scampered
B. pampered
C. hampered
D. tampered
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单项选择题
These goods are （）for export, though a few of them may be sold on the home market.

A. essentially
B. completely
C. necessarily
D. remarkably
单项选择题
I said that I could not commit myself as my academic time was not yet finished, but I would like to be at their ______ later.
A．disposal
B．guidance
C．assistance
D．supervision
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