单项选择题

The waste pipe is blocked; try ______ it out with hot water, or just call the plumber to do it.

A．flushing
B．crushing
C．brushing
D．blushing
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单项选择题
I don' t like playing piano, for I felt ______ to do what I was unwilling to do myself.
A．hindered
B．obligated
C．constrained
D．conspired
单项选择题
The world saw Jack as a rich and ______ bachelor, but really he was very shy.
A．inferior
B．essential
C．necessary
D．eligible
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