单项选择题

A．Checked them out.
B．Took notes on them.
C．Returned them to the shelves.
D．Put them in his book ba
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单项选择题
A．He was taking a walk.B．He was talking to Professor Smith.C．He was having problems with his car.D．He was having dinner.
A．He was taking a walk.
B．He was talking to Professor Smith.
C．He was having problems with his car.
D．He was having dinner.
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