l have no doubt -----he will finish the task in time.A.whether B.that C.if D.what

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BThere is no doubt thatI have no doubt thatI doubt whether/ifI have some doubt whetherThere is some doubt whether主句是否定句用that主句是肯定句用whether/if ( 同位語從句中不能夠用if)例如:There is no doubt that he will finish the task in time. There is some doubt whether he will finish the task in time. I doubt whether/if he will finish the task in time.

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B固定搭配

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在賓語從句中，若doubt一詞作“懷疑”解接賓語從句時，主句為肯定句用whether或if，主句為否定句或疑問句用that，例如：I doubt whether he will come soon.I do not doubt that he will come soon.Do you doubt that he will come soon?注意：下面這個例句中doubt的含義為“認為……未必可能”。I doubt that he will come.綜上所述，選擇B