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    21、While peace-keeping is ___ UN’s main duty, it also has programmes for ____ education, better health and business in more than 170 countries.

    A．the; an      B．不填; the  C．the; 不填        D．不填; an

    21、C

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    While peace-keeping is ___ UN’s main duty, it also has programmes for ____ education, better health and business in more than 170 countries.

    A．the; an      B．不填; the  C．the; 不填        D．不填; an

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