The government has taken some measures to solve the shortage of electricity, but

题型：同步题难度：来源：

The government has taken some measures to solve the shortage of electricity, but it may be some time
________ the situation improves.[     ]
A. since
B. when
C. unless
D. before

答案

举一反三

—You seem to have had that car for years.
—Yes, I should sell it ________ it breaks down.[     ]
A. while
B. after
C. until
D. before

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—How long do you think it will be ________ President Hu Jintao makes another visit to America?
—It all depends.[     ]
A. when
B. that
C. before
D. until

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It really seemed ages ________ the police came on the scene and cleared away the damaged cars.[     ]
A. before
B. after
C. when
D. as

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She took an umbrella with her this morning ________ she should be caught in the rain.[     ]
A. so that
B. in order that
C. in case
D. now that

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You can arrive in Beijing earlier for the meeting ________ you don"t mind taking the night train.[     ]
A. though
B. unless
C. provided
D. until

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