问题
选择题
She ____ on her homework in her study now .
A．must work
B．can work
C．must have worked
D．must be working
答案
D。
对正在发生的事进行推测。
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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。