单项选择题

All our attempts to ______the child from drowning were in vain.

A．regain
B．recover
C．reserve
D．rescue
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单项选择题
Although many people view conflict as bad, conflict is sometimes useful ______ it forces people to test the relative merits of their attitudes and behaviors.
A．by which
B．to which
C．in that
D．so that
单项选择题
My father has promised to put his car entirely at our ______ for the holiday.
A．disposal
B．usage
C．pleasure
D．disposition
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