---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.


  1. A.
    may; must
  2. B.
    will; can
  3. C.
    can; may
  4. D.
    may; will
C
試題分析：英語中有些情態(tài)動詞，通過使用不同的時態(tài)形式，可以表示“推測”的含義。1. 情態(tài)動詞 + 動詞原形：must + 動詞原形，表示對現(xiàn)在的事實(shí)進(jìn)行非常有把握的推測，一般用于肯定句。如：There must be something wrong. 一定是出了什么差錯。may / might / can / could + 動詞原形，表示對現(xiàn)在、未來事情發(fā)生的可能性的推測。此時， might, could 不表示過去，只是表示推測的語氣更加不肯定。一般情況下， may, might 用于肯定句中； can, could 用于否定句、疑問句中。根據(jù)語境可知敲門的人可能是誰呢?不確定有可能是郵遞員，故選C。
考點(diǎn)：情態(tài)動詞表示推測
點(diǎn)評：關(guān)于表示推測的情態(tài)動詞后面所接動詞形式，有下列三種情況：若對此刻正在發(fā)生的事，接“be +現(xiàn)在分詞”；若對現(xiàn)在或未來情況的推測，接動詞原形；若對過去情況的推測，接“have +過去分詞”。
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