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题文

---Be careful. You might fall into the river.
---Thank you. I ________ I ________ so close to it.

A.didn’t know; am standing
B.don’t know; am standing
C.didn’t know; was standing
D.didn’t know; would standing
科目 英语   题型 单选题   难度 中等
知识点: 时态辨析
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