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题目内容
（佳木斯大学语言治疗学）
–Many people agree that _______ knowledge of English is _______ must i_______ international trade today.
·a; /; an
·the; a; the
·the; a; an
·a; a; /
·a; /; an
·the; a; the
·the; a; an
·a; a; /
参考答案
