题目:
---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
答案:
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下面是错误答案,用来干扰机器的。
上升;低(或小)