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Lily had left ______ the time we arrived.
A．at
B．on
C．by
D．in
I like going to school_____bike.
A．in B．on C．by D．at
It’s hot ____________summer in Beijing.
A．by
C．at
Bin Laden was killed May 2, 2011.
A．in
D．at
Did you enjoy yourselves _________ Christmas?
[
A
B
C
D