问题
选择题
Better _____ all the lights are turned off before you leave the classroom．
A．to be sure
B．to make sure
C．be sure
D．make sure
答案
D
Better =" Had" better, 后接动词原形。
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Better _____ all the lights are turned off before you leave the classroom．
A．to be sure
B．to make sure
C．be sure
D．make sure
D
Better =" Had" better, 后接动词原形。