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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.