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

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

出自：信阳师范学院中学英语教学论

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