单项选择题


A．therefore
B．however
C．so
D．but
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单项选择题
A．SupposeB．AssumeC．GuessD．Imagine
A．Suppose
B．Assume
C．Guess
D．Imagine
单项选择题
A．being putB．putC．having putD．putting
A．being put
B．put
C．having put
D．putting
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