【C14】
A．answer
B．request
C．question
D．difficulty
请帮忙给出正确答案和分析，谢谢！
【C18】A．answerB．oppositeC．alternativeD．other
【C18】A．answerB．expressionC．reasonD．effect
【C20】A．answerB．methodC．solutionD．approach
【C5】A．requireB．requestC．urgeD．appeal
【C5】A．timeB．requestC．meansD．obligation
【C7】A．answerB．requestC．questionD．difficulty
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