是英语学霸的，帮我做完下面这几道题，谢谢！
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71.can you改成you can
72.②
73.Signs on the door tell you where to go in or out.
74.
(1)receive
(2)nod
75.C
72.②
73.Signs on the door tell you where to go in or out.
74.
(1)receive
(2)nod
75.C
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