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. They were surprised that a child could work out the problem ______ they themselves couldn’t.

A. once          B. while         C. then           D. if

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They were surprised that a child could work out the problem____they themselves couldn't.

  A.once     B.while    C.then      D.if

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They were surprised that a child could work out the problem ______ they themselves couldn’t.

A. once          B. while         C. then           D. If

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They were surprised that a child could work out the problem ______ they themselves couldn’t.

A.once                B.while              C.then           D.if

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They were surprised that a child could work out the problem____they themselves couldn't.

A.once   B.while   C.then   D.if

 

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