问题标题：
HowandwhyJackcometoChina___notknown.Whenandwheretobuildthenewlibrary_____notbeendecided.A.is;hasB.are;hasC.is;haveD.are;have
问题描述：
HowandwhyJackcometoChina___notknown.Whenandwheretobuildthenewlibrary_____notbeendecided.A.is;hasB.are;hasC.is;haveD.are;have
贺海晖回答：
选AhowandwhyJackcometoChina作主语谓语动词用单数.
Whenandwheretobuildthenewlibrary作主语谓语动词做单数.
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