He was observed ________ into the house and helped himself to find what he liked before the owner came back．


  1. A.
    to slip
  2. B.
    slip
  3. C.
    slipping
  4. D.
    slipped
A
本題考查observe的用法．observe sb．do sth．用于被動(dòng)形式時(shí)，要加不定式符號(hào)to，即sb．be observed to do sth．B項(xiàng)前沒有to; C、D項(xiàng)也都不符合這一用法．
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：單選題

________ to say, he is a complete ________ to this kind of thing.


  1. A.
    Strange; stranger
  2. B.
    Strangely; stranger
  3. C.
    Strangely; strange
  4. D.
    Strange; strange

查看答案和解析>>

科目：高中英語 來源： 題型：單選題

Which team will Mr Smith ________ next year?


  1. A.
    take part in
  2. B.
    join in
  3. C.
    join
  4. D.
    be joined

查看答案和解析>>

科目：高中英語 來源： 題型：單選題

Written in a hurry, ________.


  1. A.
    Tim made a lot of mistakes in the report
  2. B.
    there are plenty of mistakes in the report
  3. C.
    we found several mistakes in his letter
  4. D.
    the book is full of mistakes

查看答案和解析>>

科目：高中英語 來源： 題型：單選題

There are some encouraging signs ________ the farmers may benefit from the new program．


  1. A.
    if
  2. B.
    that
  3. C.
    whether
  4. D.
    /

查看答案和解析>>

科目：高中英語 來源： 題型：單選題

The soldiers risked ________ away to rescue the people who were caught in the flood．


  1. A.
    washing
  2. B.
    washed
  3. C.
    to be washed
  4. D.
    being washed

查看答案和解析>>

科目：高中英語 來源： 題型：單選題

The discovered collection of coins showed that the Chinese workers were afraid of not keeping their money ________. So they put it into a kind of “bank” to keep it ________.


  1. A.
    safely; safe
  2. B.
    safely; safely
  3. C.
    safe; safely
  4. D.
    safe; safety

查看答案和解析>>

科目：高中英語 來源： 題型：單選題

The book is ________ several parts, among which the last part is the most important one.


  1. A.
    made up
  2. B.
    made of
  3. C.
    made from
  4. D.
    made up of

查看答案和解析>>

科目：高中英語 來源： 題型：單選題

________ such heavy loss during the financial crisis(金融危機(jī)), the businessman didn't have the courage to go on．


  1. A.
    To suffer
  2. B.
    Suffering
  3. C.
    Having suffered
  4. D.
    Suffered

查看答案和解析>>

同步練習(xí)冊答案