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 Many people agree that ______ knowledge of English is a must in _______ international trade today.
A.the, anB.a, 不填C.the, theD.不填, the
B
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。
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