I don"t have to introduce him to you _____ you know the boy. [ ]A. until

题型：模拟题难度：来源：

I don"t have to introduce him to you _____ you know the boy.   [     ]
A. until
B. unless
C. since
D. but

答案

举一反三

They won"t give up _____ they have failed several times.   [     ]
A. as a result
B. in order that
C. although
D. since

题型：江苏期中题难度：| 查看答案

Little Mary won’t go to sleep her mother tells her an interesting bedtime story.[ ]
A．or
B．unless
C．but
D．whether

题型：江苏期中题难度：| 查看答案

It is difficult for us to learn a lesson in life _____ we"ve actually had that lesson.[ ]
A. when
B. after
C. since
D. until

题型：江苏期中题难度：| 查看答案

—Did you return Helen"s call?
—I didn"t need to _________ I"ll see her tomorrow．    [     ]
A. though
B. unless
C. when
D. because

题型：期中题难度：| 查看答案

Many people believe           __ robots will do most of our housework in the future.[     ]
A. that
B. if
C. why
D. how

题型：江苏省模拟题难度：| 查看答案