they were surprised that a child should work out the problem____they themselves couldn't.

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• they were surprised that a child should work out the problem____they themselves couldn't.
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• To his surprise,a child should work out the problem__ he himself couldn't.
• They were surprised that a child should work out the problem ________ they themselves couldn't.A.once B.then C.while D.if
• They were surprised that a four-year-old boy should work out such a difficult problem ____ they themselves couldn’t.
• They were surprised that a child should work out the problem ________ they themselves couldn't.
• they were surprised that a child should work out the problem____they themselves couldn't.A.but B.while C.if D.however麻烦针对这句话,
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