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( )21. Dr Ma, ________ORBIS doctor, has done so important ________ . job that many people are grateful to him.
A. a; a B. a; an C. an; a D. an; an
( )22. Aunt Ii________the babies very well while their parents were away.
A. looked at B. looked like C. looked up D. looked after
( )23. -I haven\'t got a digital camera.
-I think you should buy_______. It\'s useful for you.
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( )21. Dr Ma, ________ORBIS doctor, has done so important ________ . job that many people are grateful to him.
A. a; a B. a; an C. an; a D. an; an
( )22. Aunt Ii________the babies very well while their parents were away.
A. looked at B. looked like C. looked up D. looked after
( )23. -I haven\'t got a digital camera.
-I think you should buy_______. It\'s useful for you.