That is secret．A. Only knows Mary how to do itB. Only does Mary know how to do itC. On

问题补充：

That is secret．．



A. Only knows Mary how to do it

B. Only does Mary know how to do it



C. Only Mary knows how to do it

D. Mary knows only how to do it

答案：

A. Only knows Mary how to do it

B. Only does Mary know how to do it



(答案→)C. Only Mary knows how to do it

D. Mary knows only how to do it

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