单项选择题

John is the most brilliant guitarist in our city, Roger ______ him closely.

A．followed
B．following
C．to follow
D．being followed
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单项选择题
The dean of our department is supposed ______ for Florence the day before yesterday.
A．to leave
B．to have left
C．to be leaving
D．to have been left
单项选择题
Water is an essential global resource and it is up to each of us to ______ it.
A．preserve
B．maintain
C．reserve
D．conserve
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