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—Guess what! I have got A for my term paper.
—Great! You        read widely and put a lot of work into it.
A.mustB.shouldC.must haveD.should have
C
“你猜到了吗?我的论文得了A”“太好了,你一定进行了大量阅读而且投入了许多工作。” 根据语境I have got A for my term paper.可知“已经拿到了好成绩”是过去的事情,对过去的推测用must have done。故选C
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