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It's uncertain ________ the experiment is worth doing.
A．if B．that C．whetherD．how
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________ you have seen things like these before doesn't matter.
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_______you come or not is up to you.
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____ you don't like him is none of my business.
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She asked ________.
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Mary: Helen is a mere washer woman, yet she's now buying a big house.
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.____that I’m feeling all right,my brain is also beginning to work much better.
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