求老师解答：They have started an

求老师解答：They have started an
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
幸福老李 1年前 已收到1个回答 举报
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sonny44 幼苗

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B

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