单项选择题


A．However
B．Finally
C．Whereas
D．Because
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单项选择题
A．smallB．educationalC．bigD．business
A．small
B．educational
C．big
D．business
单项选择题
A．expensiveB．artificialC．educationalD．low-cost
A．expensive
B．artificial
C．educational
D．low-cost
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