单项选择题

They lost their way in the forest, and ______ made matters worse was that night began to fall.

A．that
B．what
C．it
D．which
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单项选择题
We had difficulties at first but everything worked ______ smoothly in the end.
A．off
B．out
C．away
D．up
单项选择题
Agriculture is the country's chief source of wealth, wheat ______ by far the biggest cereal crop.
A．is
B．been
C．be
D．being
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