单选题____AfightBdoubtCstopDthink
单选题
____
A
fight
B
doubt
C
stop
D
think
参考解析
解析：
句意：很显然它们学会的其中的一件事就是什么时候该停下来。因此正确选项是C。
句意：很显然它们学会的其中的一件事就是什么时候该停下来。因此正确选项是C。
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