单项选择题

—What would you wish to do if you were a college student again
—That's very hard to say, but I wish I ______ when I was a college student.

A．has not studied psychology
B．had studied psychology
C．did study psychology
D．studied psychology
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单项选择题
Eat as many vegetables as possible, for they are rich ______ iron.
A．of
B．in
C．with
D．for
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