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
人气：454 ℃ 时间：2020-04-22 10:23:19
解答
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.
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