-----Someone is knocking at the door.It ____ be Tom .
-----No, it ______ be him ;he has gone to Sydney.


  1. A.
    must, can’t
  2. B.
    might, mustn’t
  3. C.
    may, needn’t
  4. D.
    can, mustn’t
A
試題分析：考查情態(tài)動(dòng)詞表示推測。“情態(tài)動(dòng)詞+動(dòng)詞原形”表示對現(xiàn)在情況的推測；“情態(tài)動(dòng)詞+have done”表示對過去情況的推測。句意：—有人在敲門。一定是TOM�！徊豢赡苁撬�，他已經(jīng)去了悉尼了。本句中的must表示對現(xiàn)在情況有把握的肯定推測，can’t是一種有把握的否定推測。根據(jù)句意說明A正確。
考點(diǎn)：考查情態(tài)動(dòng)詞表示推測
點(diǎn)評：情態(tài)動(dòng)詞的用法比較復(fù)雜。突出的是表示推測：如果是對現(xiàn)在的情況進(jìn)行推測，使用“情態(tài)動(dòng)詞+動(dòng)詞原形”；對過去的情況進(jìn)行推測，使用“情態(tài)動(dòng)詞+have done”；情態(tài)動(dòng)詞也經(jīng)常用于虛擬語氣，要分具體情況來分析，在條件句中和賓語從句，表語從句中都有體現(xiàn)。
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