. Economics, several courses of which I have taken thus far, ________ to be difficult but useful for almost all students. A. prove　　　　　B. proves　　　　　C. have been proved　　　　D. are proved

. Economics, several courses of which I have taken thus far, ________ to be difficult but useful for almost all students.
A. prove　　　　　B. proves　　　　　C. have been proved　　　　D. are proved

出自：汉语言文学

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