If you want to study in foreign countries, good knowledge of the culture is regarded as

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; a
C. the; the
D. the; a

A. /; / (答案→)B. a; a C. the; the D. the; a解析：句意：如果你想要在国外学习，为了生活的快乐了解外国的文化被认为是一种必需要做的事。knowledge可表示“了解,知道”或“知识,认识,学问”等,是不可数名词。有时在knowledge前可直接加上不定冠词a,表示“对…有某种程度的了解或熟悉”。 must还可用作名词,作“必须做的事,必不可少的事物”解,常用于单数形式。前面用不定冠词。故选B。

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