-Look out! Your hair will get caught in the machine. -Thank you. so close to it.
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—Look out! Your hair will get caught in the machine.
—Thank you. ________ so close to it.
A. I think I am
B. I don't know I am
C. I didn't know I was
D. I had thought I was
试题答案
答案：C
解析：表示之前不知道。
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