题目内容
She ____ on her homework in her study now .
A . must work B . can work C . must have worked D . must be working
D。
解析:
对正在发生的事进行推测。
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题目内容
She ____ on her homework in her study now .
A . must work B . can work C . must have worked D . must be working
D。
对正在发生的事进行推测。