◎ 题干
You can't use the machine today because some parts_____ this week.

[     ]

A. are replaced
B. are being replaced
C. have replaced
D. are replacing
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“You can't use the machine today because some parts_____ this week. [ ]A. are replaced B. are being replaced C. have replaced D. are replacing …”主要考查了你对  【现在进行时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。