题目内容
---Has William finished writing his graduation paper yet?
---I don't know exactly, but he ________ all day.
- A.is writing
- B.has been writing
- C.was writing
- D.wrote
B
表示“一整天都在做某事”要用现在完成进行时.
表示“一整天都在做某事”要用现在完成进行时.
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