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题目内容
（华北水利水电大学英语）
–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；/
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