A．Bob is too tired to study any more.
B．He told Bob not to study late at night.
C．Bob didn't hear the alarm.
D．He had often advised Bob to study.

A.Bob
B.
B．He
C.
C．Bob
D.
D．He

【参考答案】

D
解析：W: Why is Bob so upset?
M: He's been studying d......

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