单选题
Which of the following sentences indicates an obligation?
A、
He must move the furniture himself.
B、
Your father must be expecting you home.
C、
You must have left your handbag in the theatre.
D、
Her eyes are red. She must have been crying.
【正确答案】
A
【答案解析】
考查情态动词 A选项“他必须自己搬动家具”中must表示义务，而其他三个选项中的must都是表推测，故选A。
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