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

解析该句考查主谓一致。其中several courses of which I have taken thus far为设置的干扰项。由于主语为表示学科的单数名词，故谓语应是单数形式。

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