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科目： 來源：不詳 題型：單選題

Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
A．beforeB．as
C．unlessD．in case

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科目： 來源：不詳 題型：單選題

I will accept Guy coming with us, ________ he pays for his own meals.
A．only ifB．so that
C．ever sinceD．even though

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科目： 來源：不詳 題型：單選題

________ H7N9 is a deadly virus, it is still safe to eat thoroughly­cooked chicken.
A．UntilB．While
C．IfD．Since

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科目： 來源：不詳 題型：單選題

The movie Life of Pi is so attractive that it holds the audience's curiosity ________ the story reaches the end.
A．untilB．before
C．afterD．when

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科目： 來源：不詳 題型：單選題

Jerry has promised to keep the secret, so he won't tell anyone ________ asked to.
A．untilB．now that
C．unlessD．even though

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科目： 來源：不詳 題型：單選題

It will be another 50 years ______ our country is expected to reach the level of a medium developed country.
A．sinceB．before
C．thatD．when

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科目： 來源：不詳 題型：單選題

House prices vary from place to place and are usually high ________ there are famous schools.
A．whenB．since
C．whereD．whether

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科目： 來源：不詳 題型：單選題

We can't wait any longer ________ we'll miss the plane.
A．orB．but
C．soD．yet

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科目： 來源：不詳 題型：單選題

The new system needs to be in operation for five months ________ it can be updated.
A．asB．while
C．beforeD．once

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科目： 來源：不詳 題型：單選題

________ it is, the boy never seems to be able to finish it off.
A．However interesting a book
B．Whatever interesting a book
C．How interesting a book
D．What an interesting book

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