【C20】A．thoseB．thatC．oneD．ones

【C20】A．whichB．thatC．whetherD．when

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This hospital is______provides the best services in the city.A．whatB．thatC．one whichD．the

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Its such a difficult problem______no one can work it out.A．asB．thatC．soD．this

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【C20】A．theseB．thoseC．the oneD．that

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【C20】A．certainB．anyC．someD．one

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Many workers were organized to clear away_______ remained of the World Trade Center.A.thoseB.thatC.

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Is this the place ____________the exhibition was held?A.whereB.thatC.on whichD.the one

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