单项选择题

The experiment ______ his theory.

A．confirm
B．confirmed
C．correspond
D．corresponded
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单项选择题
He ______ his textbooks when he left school and never reopened them.
A．put back
B．put aside
C．put down
D．put off
单项选择题
Not only cars but also new-type trucks ______ with air conditioning.
A．equip
B．equipped
C．are equipped
D．was equipped
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