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
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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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By the end of next month we ______ the review on the research findings.
A．will finish
B．will be finishing
C．will have finished
D．have finished
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