–Many people agree that _______ knowledge of English is _______ must in _______ international trade today. A a; /;an B the;a；the C the;a；an D a;a；/

–Many people agree that _______ knowledge of English is _______ must in _______ international trade today.
A
a; /;an
B
the;a；the
C
the;a；an
D
a;a；/

出自：山东医学高等专科学校大学英语（高起专）

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