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I ______ my mind to study harder since I visited the Shanghai Supercomputer Centre.
A.am making upB.have made upC.made upD.had made up
B

试题分析:句意:自从我参观了上海超级电脑中心,我就下定决心更努力的学习。本句考查的是时态,因为句中有since,自从,它常和现在完成时连用,故本题应该选B。make up one’s mind to do sth. 是一个句型,下定决心去做某事。A选项是现在进行时;C选项是一般过去时;D选项是过去完成时。
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