单项选择题

A．She didn’’t clean the dorm.
B．Her dorm is messy.
C．She will help the man clean his dorm.
D．She cleaned the library.
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单项选择题
The balance of nature can prevent soil deterioration.
A．Y
B．N
C．NG
单项选择题
How many stars entered the Union between 1818 and 1912
A．30
B．28
C．13
D．8
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