How and why Jack come to China___not known.When and where to build the new library_____not been decided.A.is;has B.are;has C.is;have D.are;have
问题描述：
How and why Jack come to China___not known.When and where to build the new library_____not been decided.A.is;has B.are;has C.is;have D.are;have
答
A.is;has
答
选 A how and why Jack come to China 作主语 谓语动词用单数.
When and where to build the new library 作主语 谓语动词做单数.