第43题应填__________

第43题应填__________A.is used to B.showing C.used to D.explaining

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第42题应填__________

第42题应填__________A.instead of B.in place of C.to take place of D.exchange

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After the use of the laser beam, surgeons can perform operat

After the use of the laser beam, surgeons can perform operations which A.leave t

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