单项选择题

The ______ spent in unscrewing the rusty bolt left her exhausted.

A．expedition
B．execution
C．employment
D．exertion
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单项选择题
The policeman ______ noted something different about the fellow' s accent.
A．undoubted
B．doubtless
C．doubtful
D．undoubting
单项选择题
If most breadwinners ______ a day' s pay to the Hope Project, then it will be hopeful.
A．gift
B．present
C．donate
D．give
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