Many people agree that knowledge of English is a must in international trade today.
A. the, an
B. a, 不填
C. the, the
D. 不填, the
网友回答
A. the, an
(答案→)B. a, 不填
C. the, the
D. 不填, the
解析:knowledge 虽为不可数名词,但其前却可用不定冠词,表示某种程度的知识,有类似some的意思;第二空不填冠词,是因为trade 为不可数名词,表示泛指时不用冠词。