单项选择题


A．it
B．which
C．that
D．as
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单项选择题
A．cheapB．expensiveC．lightD．heavy
A．cheap
B．expensive
C．light
D．heavy
单项选择题
A．looking onB．looking throughC．looking upD．looking for
A．looking on
B．looking through
C．looking up
D．looking for
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