问题
选择题
Usually there might be a lot of accidents in the heavy fog. I happened to witness ______ this morning. [ ]
A. it
B. those
C. one
D. that
答案
答案：C
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Usually there might be a lot of accidents in the heavy fog. I happened to witness ______ this morning. [ ]
A. it
B. those
C. one
D. that
答案：C