问题描述：
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1.The math problem was very difficult for him,but he ___ it ___.A.worked;on B.worked;out
C.worked;with D.worked;for
2.The channel ___ ___ ___ (使可能成为） to travel by train from Paris to London
1.The math problem was very difficult for him,but he ___ it ___.A.worked;on B.worked;out
C.worked;with D.worked;for
2.The channel ___ ___ ___ (使可能成为） to travel by train from Paris to London
问题解答：
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