单项选择题

A．a number of
B．little
C．few
D．plenty of
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单项选择题
A．difficultyB．exactlyC．easilyD．only
A．difficulty
B．exactly
C．easily
D．only
单项选择题
A．whatB．whichC．thatD．it
A．what
B．which
C．that
D．it
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