单项选择题

It will rain, ______ the barometer is falling.

A．so
B．for
C．as
D．since
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单项选择题
Don't ______ about lunch for the instructors, because they promised to get some on the way.
A．bother
B．fuss
C．trouble
D．think
单项选择题
When John was away on business, his neighbour gave his wife ______ with the housework.
A．an aid
B．a help
C．a hand
D．a lift
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