单项选择题

A．They left their pets with neighbors.
B．They rented their house to a student.
C．They hired someone to stay in their home.
D．They asked their gardener to watch their house.
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单项选择题
A．He is not that far away if she wants to visit.B．He doesn’t believe that she will really miss him.C．He welcomes her phone calls any time.D．He will telephone her as often as he can.
A．He is not that far away if she wants to visit.
B．He doesn’t believe that she will really miss him.
C．He welcomes her phone calls any time.
D．He will telephone her as often as he can.
填空题
The key advantages of fuel cells include raising the ____________ and reducing air pollution.
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