问题
选择题
He is the only person who saw the accident ______. So he is the most important witness.[ ]
A. happen
B. to happen
C. having happened
D. happened
答案
答案：A
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He is the only person who saw the accident ______. So he is the most important witness.[ ]
A. happen
B. to happen
C. having happened
D. happened
答案：A