---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(yǔ)中有些情態(tài)動(dòng)詞，通過(guò)使用不同的時(shí)態(tài)形式，可以表示“推測(cè)”的含義。1. 情態(tài)動(dòng)詞 + 動(dòng)詞原形：must + 動(dòng)詞原形，表示對(duì)現(xiàn)在的事實(shí)進(jìn)行非常有把握的推測(cè)，一般用于肯定句。如：There must be something wrong. 一定是出了什么差錯(cuò)。may / might / can / could + 動(dòng)詞原形，表示對(duì)現(xiàn)在、未來(lái)事情發(fā)生的可能性的推測(cè)。此時(shí)， might, could 不表示過(guò)去，只是表示推測(cè)的語(yǔ)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(wèn)句中。根據(jù)語(yǔ)境可知敲門(mén)的人可能是誰(shuí)呢?不確定有可能是郵遞員，故選C。
考點(diǎn)：情態(tài)動(dòng)詞表示推測(cè)
點(diǎn)評(píng)：關(guān)于表示推測(cè)的情態(tài)動(dòng)詞后面所接動(dòng)詞形式，有下列三種情況：若對(duì)此刻正在發(fā)生的事，接“be +現(xiàn)在分詞”；若對(duì)現(xiàn)在或未來(lái)情況的推測(cè)，接動(dòng)詞原形；若對(duì)過(guò)去情況的推測(cè)，接“have +過(guò)去分詞”。
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