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科目： 來源：不詳 題型：單選題

The medicine works more effectively ______ you drink some hot water after taking it.
A．a(chǎn)sB．untilC．a(chǎn)lthoughD．if

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科目： 來源：不詳 題型：單選題

—Where’s that report?
—I brought it to you _______ you were in Mr.Black’s office yesterday.
A．ifB．whenC．becauseD．before

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科目： 來源：不詳 題型：單選題

You have failed two tests.You’d better start working harder,_______ you won’t pass the course.
A．a(chǎn)ndB．soC．butD．or

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科目： 來源：不詳 題型：單選題

Leave your key with a neighbor _______ you lock your-self out one day.
A．ever sinceB．even if
C．soon afterD．in case

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科目： 來源：不詳 題型：單選題

Help others whenever you can _______ you will make the world a nicer place to live in.
A．a(chǎn)ndB．orC．unlessD．but

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科目： 來源：不詳 題型：單選題

We had to wait half an hour _______ we had already booked a table.
A．sinceB．a(chǎn)lthoughC．untilD．before

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科目： 來源：不詳 題型：單選題

You have to get rid of smoking, ____ you may die of lung cancer.
A．a(chǎn)ndB．butC．soD．otherwise

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科目： 來源：不詳 題型：單選題

----Won’t you go shopping with your mother ?
----____she promises to buy me a new sweater .
A When     B If    C Unless  D Whether

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科目： 來源：不詳 題型：單選題

It is three years_____ his father smoked .
A when  B after  C since  D while

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科目： 來源：不詳 題型：單選題

—____when has the country been open to international trade?
—1978,I suppose.
A．SinceB．In
C．FromD．After

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