问题
选择题
When I walked ______ the station, I saw the accident ______. [ ]
A. past; to happen
B. passed; happened
C. past; happen
D. psst; happening
答案
答案：C
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When I walked ______ the station, I saw the accident ______. [ ]
A. past; to happen
B. passed; happened
C. past; happen
D. psst; happening
答案：C