15．If you want to study in foreign countries，____ good knowledge of the culture is regarded as ____ must for you to live happily．（　�。�
A．/；/B．a； aC．the； theD．the； a

分析 如果你想到國外學習，對你來說為了生活的快樂，熟知那里的文化被認為是一件必須要做的事．

解答 答案：B
由于a good knowledge of（ 熟知，通曉）是固定短語，因此第一個空缺處應加不定冠詞a；根據(jù)句意可知，句中的must"必須做的事，必不可少的事物"，是可數(shù)名詞，在這里表示泛指，意為：一件必須要做的事；故選B

點評 本題考查了不定冠詞的用法．做本題的關鍵在于：了解固定短語a good knowledge of以及must作為可數(shù)名詞的用法；因此要做好此類型的題目，除了熟練掌握冠詞的用法之外，還應注意總結(jié)含有冠詞的固定短語以及某些可數(shù)名詞或抽象名詞的用法．

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