2. 外语
  3. Every knife and fork _____ carefully.

Every knife and fork _____ carefully.

admin2009-06-28  1
问题 Every knife and fork _____ carefully.
选项 A、have cleaned
B、has cleaned
C、have been cleaned
D、has been cleaned
答案D
解析 knife和fork一起使用，被看做一个整体，指一套刀叉，它们作主语时谓语动词用单数。又因为主谓之间是被动关系，所以用被动语态。
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