[A] what [B] since [C] as [D] that

参考答案:

C本题考查从句引导词。空格所在句子中存在比较，即，you have to pass them not... you do when the road is dry（路面滑时开车不像路面干燥时那样快），因此空格处填入的词应引导比较状语从句you do when... ，从句中do为上文动词pass的替代词。［C］as可用于比较结构，表示“像……一样，如同”，如：He doesn’t earn as much as I do.（他挣的钱不如我多。）因此［C］正确。what只能引导名词性从句，what you