A．WhetherB．WhenC．IfD．Although

【C16】A．whetherB．whenC．whereD．why

【C15】A．tillB．whenC．whereD．although

【B15】______A．thatB．whenC．ifD．because

I doubt____________he will lend you the book.A.whetherB.whenC.thatD.which

【C12】A．whetherB．whenC．unlessD．or

【C5】A．BecauseB．WhenC．IfD．Whether