单项选择题

“When you leave the room．make sure __________ the door．”

A．of locking
B．you lock
C．for you to lock
D．to lock
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单项选择题
Because she gates dishonesty, she is __________ her son．
A．strict on
B．heavy on
C．hard on
D．tight on
单项选择题
Saudi Arabia has planted the trees to keep the sand from __________ fertile areas．
A．taking over
B．taking out
C．taking down
D．taking up
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