(单选题) –Many people agree that _______ knowledge of English is _______ must in _______ international trade today.(本题4.0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4.0分)
A、 a; /;an
B、 the;a；the
C、 the;a；an
D、 a;a；/

出自：川北医学院-英语

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