单项选择题

I was so tired that I _________ when I was sitting in the armchair reading.

A．dropped away
B．dropped out
C．dropped off
D．dropped through
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单项选择题
He made such a _________ contribution to the university that they are naming one of the new buildings after him.
A．genuine
B．minimum
C．modest
D．generous
单项选择题
The returns in the short _________ are likely to be small, but over a number of years the investment will be well repaid.
A．term
B．spell
C．interval
D．time
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