单项选择题

—Must I turn off the light when I leave—No, _________.

A． you mustn't
B． you can't
C． you needn't
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单项选择题
There are a lot of spelling mistakes in your composition. You should have been more
A． carefully
B． careless
C． careful
单项选择题
—How soon will you be able to finish your homework
A． After two hours
B． In two hours
C． Two hours later
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