单项选择题

By the time he retires Mr. Smith（）in this hotel for almost 40 years.

A．will have worked
B．will work
C．have worked
D．will has worked

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单项选择题
It is necessary to greet the guest with a hearty smile（）to create a pleasant atmosphere and make the guest feel at home.

A．so that
B．in order
C．such as
D．because of
单项选择题
Room service is（）in the room.

A．to serve meals
B．to do service
C．to clean up
D．to take care of guests
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