单项选择题

A．clean
B．cleaner
C．cleanest
D．more clean
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单项选择题
A．beforeB．sinceC．afterD．in
A．before
B．since
C．after
D．in
单项选择题
What can we learn from the conversation
A．He bought a black tie.
B．He bought a black hat.
C．He bought a blue hat.
D．He bought a blue tie.
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