Some people have the idea you can cross Canada in less than five days.A. what B. that C. w

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A. what
(答案→)B. that
C. which
D. when
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。