单项选择题

Mary was not promoted because she dreamed too much and ______ in her lessons.

A．fell out
B．fell over
C．fell through
D．fell behind
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单项选择题
Many artists ______ their subjects before putting paint to canvas.
A．snatch
B．sketch
C．ski
D．skate
单项选择题
We had to ______ dried milk as fresh milk wasn't available.
A．add up to
B．face up to
C．fall back on
D．carry on with
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