单选题：In Stickgold's experiment, those who were kept awake on the

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题目内容：
In Stickgold's experiment, those who were kept awake on the first night A．could very well remember the direction of the diagonal bar
B．didn't do any better after two nights' slee
C．were as tired as those who were no
D．could recall the direction of more bars than those who were no
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