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

I dont doubt_____to help.A．wantingB．their wantingC．them to wantD．they wanting

I dont doubt_____he can finish the task on time.A．whyB．thatC．whetherD．when

I am doubtful whether I can solve the puzzle, but I ’llhave a ____ at it.A) shootB)

If you’re going swimming tomorrow morning, you can _______me_______, because I’ll be

Young ___________John was, he was able to swim across the channel within minutes.A.asB.s

I know Jonathan quite well and never doubt ______ he can do a good job of it.A.whetherB.th