【40】A．thatB．howC．whetherD．when

_____________ 查看材料A.whatB.howC.whetherD.when

【C20】A．whichB．thatC．whetherD．when

Please show me ____ to do it.A: whatB: howC: whichD: when

I doubt_____they can swim across the river.A．whyB．thatC．whetherD．when

【C2】A．thatB．whichC．whetherD．what

_____ I like about her is her liveliness .A.ThatB.HowC.WhatD.Which