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科目： 來源：不詳 題型：單選題

It is well understood _____ controls the flow of carbon dioxide in and out the atmosphere today.
A．thatB．whenC．whatD．how

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科目： 來源：不詳 題型：單選題

No sooner had we reached the top of the hill _____ we all sat down to rest.
A．whenB．thenC．thanD．until

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科目： 來源：不詳 題型：單選題

The reason for the party was _____ it was Sue’s birthday.
A．becauseB．thatC．because ofD．due to

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科目： 來源：不詳 題型：單選題

_____ quite recently, most mothers in Britain did not take paid work outside the home.
A．Before B．Until C．From D．Since

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科目： 來源：不詳 題型：單選題

I have kept that portrait _____ I can see it every day, as it always reminds me of my university days in London.
A．which B．where C．whether D．when

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科目： 來源：不詳 題型：單選題

You see the lightning _____ it happens, but you hear the thunder later.
A．the instantB．for an instantC．on the instantD．in an instant

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科目： 來源：不詳 題型：單選題

They decided to chase the cow away _____ it did more damage.
A．unlessB．untilC．beforeD．a(chǎn)lthough

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科目： 來源：不詳 題型：單選題

_____ he works hard, I don’t mind when he finishes the experiment.
A．As soon asB．As well asC．So far asD．So long as

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科目： 來源：不詳 題型：單選題

_____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.
A．Now thatB．Ever sinceC．So thatD．As long as

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科目： 來源：不詳 題型：單選題

_____ or not we had a baby, we couldn’t survive only on my salary.
A．AsB．EvenC．HoweverD．Whether

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