—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
考查虛擬語氣。句意：你猜怎么著？我的學(xué)期論文得了個A�！袅�。你一定廣泛的閱讀了，并且投入了很多工作吧！“must+have+done”表示對過去事情的肯定推測，譯成“一定做過某事”，本題中read是過去分詞，故選C。
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