I set up email addresses for connecting with my parents last May. But I didn’t write to them as often as I ______.
A．shouldB．must haveC．should haveD．must
C

試題分析：考查情態(tài)動(dòng)詞的完成式：句意：去年五月我給父母發(fā)了一份電子郵件想和他們聯(lián)系，但是我沒有象應(yīng)該的那樣經(jīng)常給他們寫信。因?yàn)橹v的是過去的事情，所以是情態(tài)動(dòng)詞的完成式，排除AD項(xiàng)，must have done過去一定做過…，should have done本應(yīng)該做而沒有。選C。
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