题目列表(包括答案和解析)
. They were surprised that a child could work out the problem ______ they themselves couldn’t.
A. once B. while C. then D. if
They were surprised that a child could work out the problem____they themselves couldn't.
A.once B.while C.then D.if
They were surprised that a child could work out the problem ______ they themselves couldn’t.
A. once B. while C. then D. If
They were surprised that a child could work out the problem ______ they themselves couldn’t．
A．once B．while C．then D．if
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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