问题
选择题
They have started an investigation, ________ are being kept secret. [ ]
A. details of which
B. of which the details
C. and the detail
D. the details of it
答案
答案：B
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They have started an investigation, ________ are being kept secret. [ ]
A. details of which
B. of which the details
C. and the detail
D. the details of it
答案：B