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题目内容
（信阳师范学院中学英语教学论）
We did not know exactly what had happened，but we that something unusual had happened.(本题1.0分)
A、 were knowing
B、 did know
C、 have known
D、 did not know
A、 were knowing
B、 did know
C、 have known
D、 did not know
参考答案
