单项选择题


A．to
B．at
C．on
D．about
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单项选择题
A．expensiveB．mechanicalC．flourishing .D．complicated
A．expensive
B．mechanical
C．flourishing .
D．complicated
单项选择题
A．answeredB．metC．calculatedD．remembered
A．answered
B．met
C．calculated
D．remembered
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