单选题：They are endeavoring to reform the present rules.

题目内容：

They are endeavoring to reform the present rules. A．trying
B．working
C．doing
D．making

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

请在第(61)处填上正确答案

请在第__(61)__处填上正确答案 A．water B．air C．energy D．safety

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请在第__(53)__处填上正确答案 A．down B．over C．up D．into

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The index is the government's chief gauge of future economic activityA．measure

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根据材料，回答问题。A Phone That Knows You're BusyIt's a modem problem: you're too busy to

分类：理工类题型：单选题

分类：理工类题型：单选题