单选题Some people have the&nbsp

问题补充：

单选题Somepeoplehavetheidea_____youcancrossCanadainlessthanfivedays.A.whatB.thatC.whichD.when

答案：

B解析考查同位语从句。同位语从句That you can cross Canada in less than five days解释名词the idea的内容。That只起引导作用，不在句中做任何成分。