His mother looked very tired，for she _____ the house herself all day.A．had clean
题型：不详难度：来源：
His mother looked very tired，for she _____ the house herself all day.| A．had cleaned | B．has been cleaning | C．had been cleaning | D．has cleaned |
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答案
| C |
解析
| 考查完成进行时。根据关键词all day可知应该使用完成进行时。再根据上文的looked可知应该使用过去完成进行时。 |
举一反三
----- I’ ll give you a ring about eight.
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