单项选择题

I am not sure whether I can gain any profit from the investment, so I can't make a (n) definite promise to help you.

A．exact
B．defined
C．obvious
D．sure
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单项选择题
I quivered with fear at the strange sound.
A．shook
B．escaped
C．stung
D．suffered
单项选择题
I must go now. By the way, if you want that book, I'll bring it next time.
A．Incidentally
B．Accidentally
C．Occasionally
D．Consequently
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