52单词网 > 高中英语 > 高中英语题库 > -The dustbins for three weeks． -In fact, they once a week． [ ] A． haven't emptie

-The dustbins for three weeks． -In fact, they once a week． [ ] A． haven't emptie

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-The dustbins for three weeks． -In fact, they once a week． [ ] A． haven't emptie

－The dustbins ________ for three weeks．

－In fact, they ________ once a week．

[]A．

haven't emptied; should have been emptied

B．

haven't been emptied; should be emptied

C．

haven't been emptied; should have emptied

D．

haven't emptied; should have emptied

试题答案

答案：B

解析：

根据句意，第一个空应该用现在完成时态的被动语态；第二个空为情态动词的被动语态。

标签：inweekstheyfactdustbins

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