问题
选择题
30.They ______ be at home. You see, the door is locked from the outside.
A．can’t
B．may
C． must
D． mustn’t
答案
答案：A
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30.They ______ be at home. You see, the door is locked from the outside.
A．can’t
B．may
C． must
D． mustn’t
答案：A