单项选择题

--Would you like some butter --No, thanks. I'm ______ a diet.

A．in
B．on
C．at
D．of
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单项选择题
Education levels are strongly related ______ income.
A．to
B．in
C．on
D．with
单项选择题
The astronauts ______ returning from the moon to the earth according to the plan.
A．succeeded in
B．success for
C．succeed to
D．succeed at
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