单选题
All his attempts to argue about the rightness were ______.
A、
futile
B、
not important
C、
effective in use
D、
without reason
【正确答案】
A
【答案解析】
futile无效果的,琐细的;not important不重要的;effective in use在使用中有效的;without reason没有理由的。
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