(单选题) –Many people agree that _______ knowledge of English is _______ must in _______ international trade today.(本题2.0分) A、 a; /; an B、 the; a; the C、 the; a; an D、 a; a; /

(单选题) –Many people agree that _______ knowledge of English is _______ must in _______ international trade today.(本题2.0分)
A、 a; /; an
B、 the; a; the
C、 the; a; an
D、 a; a; /

出自：大连工业大学-大学英语3

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