问题
选择题
I was out of town at the time, so I don't know exactly how it ____.[ ]
A. was happening
B. happened
C. happens
D. has happened
答案
答案：B
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I was out of town at the time, so I don't know exactly how it ____.[ ]
A. was happening
B. happened
C. happens
D. has happened
答案：B