试题与答案

Tim's mum is worried _____ her son's eye

题型:选择题

题目:

Tim's mum is worried _____ her son's eyesight as he plays online games too much. [ ]

A. for

B. about

C. with

D. of

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:采用图上计算法,逆箭头的方向算K、I、J和F各项工作的最迟完成时间和开始时间,推算出D的最迟完成时间即为F工作的最迟开始时间,为13个月。

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