单项选择题

You can borrow my computer（）you promise to use it carefully.

A．as long as
B．while
C．since
D．so that

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单项选择题

Because of her poor health, the manager permitted her（）early.

A．leaving
B．to be leaving
C．to leave
D．to have been left

单项选择题

George preferred working to（）leisurely at home.

A．be sitting
B．sitting
C．to sit
D．have sat

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