单项选择题

I don't ______ when I heard from him.

A．remember
B．learn by heart
C．keep in mind
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单项选择题
He usually gets up ______ 7 every morning.
A．at
B．about
C．on
单项选择题
I think the photo ______ by my Uncle George.
A．to be taken
B．has taken
C．was taken
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