The new system should be tried out first _______ it is put into use.A. beforeB.

题型：0110 模拟题难度：来源：

The new system should be tried out first _______ it is put into use.A. before
B. after
C. when
D. while

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举一反三

—When are you going to fly to Taiwan this summer?
—________ we finish school. It will be a great holiday. [ ]
A. Because
B. Since
C. Until
D. As soon as

题型：江苏省模拟题难度：| 查看答案

—Mum, can I play QQ Farm?
—I"m sorry, you can"t play this game _______ you finish your homework.[ ]
A. when
B. after
C. until
D. if

题型：模拟题难度：| 查看答案

I am not sure ________ she likes seeing Beijing Opera. ________ she does, I will take her to the theatre.[ ]
A. whether; Whether
B. whether; if
C. if; Whether
D. if; Because

题型：0111 模拟题难度：| 查看答案

I usually sleep with the window open ________ it"s very cold. [ ]
A. until
B. unless
C. when
D. if

题型：浙江省模拟题难度：| 查看答案

It"s a nice house ________ it hasn"t got a garden.[ ]
A. and
B. or
C. but
D. so

题型：模拟题难度：| 查看答案