单选题_____AeasyBpossibleChardDproper
单选题
_____
A
easy
B
possible
C
hard
D
proper
参考解析
解析：
综合上下文，只有hard（困难的）符合该段逻辑。
综合上下文，只有hard（困难的）符合该段逻辑。
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