单项选择题

Do you think that it is necessary to make yourself （）？

A．understand
B．understood
C．understanding
D．being understood

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单项选择题

企业战略具有双重属性，下列选项中不属于同一属性的是（）。

A.纲领性
B.应变性
C.竞争性
D.风险性

单项选择题

By the end of next semester，we（）more than three thousand new words.

A．have learned
B．will learn
C．will have learned
D．have been learning