问题
选择题
The experts were doing their experiment in the lab, ______ what happened outside. [ ]
A. didn't know
B. not knew
C. not knowing
D. having not known
答案
答案：C
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The experts were doing their experiment in the lab, ______ what happened outside. [ ]
A. didn't know
B. not knew
C. not knowing
D. having not known
答案：C