问题
选择题
_____, this physics problem seemed simple, but when I tried to work it out, I just couldn't. [ ]
A. On one hand
B. In my opinion
C. At first sight
D. On its own
答案
答案：C
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_____, this physics problem seemed simple, but when I tried to work it out, I just couldn't. [ ]
A. On one hand
B. In my opinion
C. At first sight
D. On its own
答案：C