--- Guess what! I have got A for my term paper.
--- Great! You _____ read widely and put a lot of work into it..

A．mustB．should
C．must haveD．should have

C

解析試題分析： 情態(tài)動(dòng)詞表肯定推測(cè)。題意，猜猜看，我得了A。 棒極，人肯定付出很多努力。根據(jù)上句中have done 得了事情已經(jīng)發(fā)生，所以表示對(duì)過(guò)去的肯定推測(cè)，用must have done .故選 C項(xiàng)。
考點(diǎn) 情態(tài)動(dòng)詞

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