You know, ________ knowledge of ________computer is necessary to a secretary(秘書(shū)).
A．a(chǎn); /B．the; theC．the; /D．a(chǎn); a
A
考查冠詞：一般情況knowledge是抽象名詞，不可數(shù)，不能加冠詞。但如果是指對(duì)專(zhuān)門(mén)一項(xiàng)技術(shù)或者學(xué)科的掌握，就變成可數(shù)了，前面要加a。后面computer，電腦，泛指，不需要冠詞。選A。
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