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  3. Economics, several courses of which I have taken thus far, ______ to be difficult but useful for almost all students. ( )

Economics, several courses of which I have taken thus far, ______ to be difficult but useful for almost all students. ( )

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问题 Economics, several courses of which I have taken thus far, ______ to be difficult but useful for almost all students. ( )
选项 A、prove
B、proves
C、have been proved
D、are proved
答案B
解析
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