分类：教育/科学-升学入学-高考
问题：英语单选一道1.AccordingtoBillGates,the 
1.ding to Bill Gates,the idea ___ we can play video games and receive e-mails without sitting at a keyboard will come ture.Howver,it is unclear ___this kind of computer will be on sale and ____ it will cost.A.which;that;whatB.that;whether;how muchC.that;when;how much1.ding to Bill Gates,the idea ___ we can play video games and receive e-mails without sitting at a keyboard will come ture.Howver,it is unclear ___this kind of computer will be on sale and ____ it will cost.A.which;that;whatB.that;whether;how muchC.that;when;how muchD.that;that;how much
回答：C. （应该是这样的）

___ we can play video games and receive e-mails without sitting at a keyboard will come ture.是同位语从句，用that 不用which.

___this kind of computer will be on sale and ___ it will cost.
是并列的主语从句。 根据语境，不清楚何时上市销售更好，故不用 that, whether,而用when。