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Watching children, particularly they don’t know you are doing so, is really a pleasure. A. as B. while C. when D. since 【查看更多】

 

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Watching children, particularly ________ they don't know you are doing so, is really a pleasure.


  1. A.
    as
  2. B.
    when
  3. C.
    while
  4. D.
    since

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Watching children, particularly      they don’t know you are doing so, is really a pleasure.
    A. as       B. while      C. when      D. since

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Watching children, particularly ________ they don't know you are doing so, is really a pleasure.

[　　]

A．as
B．since
C．after
D．that

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Watching children, particularly ________ they don’t know you are doing so, is really a pleasure.

A．as

B．when

C．while

D．since

 

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Watching children, particularly ________ they don’t know you are doing so, is really a pleasure.

A．as

B．when

C．while

D．since

 

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