--- 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
情態(tài)動詞表推測的用法。說話人聽到對方說 “I have got A for my term paper”，據(jù)此來推斷對方一定是讀了好多書，花費了大量的心血。 “must have+過去分詞”表示對過去發(fā)生事情較有把握的推測；“should have+過去分詞”則表示過去應(yīng)該做，但實際上沒有，與題意不符。
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