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科目： 來源：不詳 題型：單選題

Will you help him________ you see an old man in trouble ?
A．thoughB．so C．becauseD．when

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科目： 來源：不詳 題型：單選題

We must never think that we are good at everything __________ others are good at nothing.
A．sinceB．howeverC．whileD．a(chǎn)s

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科目： 來源：不詳 題型：單選題

People often have this belief ___development is bad for the environment, but this does not have to be true.
A which     B whose       C that       D when

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科目： 來源：不詳 題型：單選題

_______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.
A．WhileB．WhenC．SinceD．if only

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科目： 來源：不詳 題型：單選題

    you understand this rule, you’ll have no further difficulty.
A．UntilB．UnlessC．ThoughD．Once

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科目： 來源：不詳 題型：單選題

___________there are many different types of food, some animals spend their lives eating only one type.
A．SinceB．Unless C．OnceD．While

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科目： 來源：不詳 題型：單選題

You shouldn’t have failed the job interview. Why didn’t you do ___ the expert suggested?
A．ifB．whenC．a(chǎn)sD．because

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科目： 來源：不詳 題型：單選題

Your parents have given you all the facts _____ you can judge for yourself easily
A．even ifB．a(chǎn)s ifC．such thatD．so that

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科目： 來源：不詳 題型：單選題

—What do you think about the new teacher?
—________ the new teacher is an elegant lady, she can be extremely difficult to work with.
A．As ifB．As long asC．BecauseD．While

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科目： 來源：不詳 題型：單選題

— What a shame ! It turned out to be a failure.
— We missed a process,_______ we could not succeed in the experiment.
A．a(chǎn)nd otherwiseB．a(chǎn)nd thereforeC．or perhapsD．but luckily

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