单项选择题

Although Helen is a new teacher, she knows ______ student in her class.

A．every of
B．every
C．all
D．all of
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单项选择题
Nowhere else in the world______ more beautiful fight than in Switzerland.
A．you can fmd
B．is found
C．can you find
D．has been found
单项选择题
-- There is a bad smell hem.-- Oh, dear ! I______ the gas.
A．must forget turning off
B．must forget to turn off
C．must have forgotten turning off
D．must have forgotten to turn off
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