摘要：从A.B.C.D四个选项中.选出可以填入空白处的最佳选项.21．--- Do you think we should accept that offer? --- Yes, we should, for we such bad luck up till now, and time out. A．have had; is running B．had; is running C．have; has been run D．have had; has been run

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从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。Some pre-school children go to a day care center, __________ they learn simple games and songs.


  1. A.
    then
  2. B.
    there
  3. C.
    while
  4. D.
    where
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从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

The manager suggested an earlier date ____________ the meeting.


  1. A.
    on
  2. B.
    for
  3. C.
    about
  4. D.
    with
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从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

I won't call you, ________ something unexpected happens.


  1. A.
    unless
  2. B.
    whether
  3. C.
    because
  4. D.
    while
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从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

We all know that, __________, the situation will get worse.


  1. A.
    not if dealt carefully with
  2. B.
    if not carefully dealt with
  3. C.
    if dealt not carefully with
  4. D.
    not if carefully dealt with
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从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

I smell something __________ in the kitchen. Can I call you back in a minute?


  1. A.
    burning
  2. B.
    burnt
  3. C.
    being burnt
  4. D.
    to be burnt
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