单项选择题

A．alert
B．awake
C．aware
D．informed
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单项选择题
A．willB．shouldC．mayD．must
A．will
B．should
C．may
D．must
单项选择题
A．playingB．demonstratingC．showingD．exhibiting
A．playing
B．demonstrating
C．showing
D．exhibiting
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