-How much difficulty did you have_______ this problem?
-_______. It's quite easy.
A．to solve, Nothing B．solving; None
C．to solve, NoneD．solving; Nothing
B

試題分析：句意：你解決這個問題有多大的困難？沒有。這很容易。Have difficulty doing sth做某事有困難，none沒有。所以選B。
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