单项选择题

After several days of isolation on the deserted island, the sailor began to______of ever getting back home.

A．disappoint
B．displace
C．depress
D．despair
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______they can change their sales strategies, the future for their company will be indeed bleak.
A．Even if
B．Now that
C．As long as
D．Unless
单项选择题
There are means by which the constitution has been______over so long a time to the needs of a changing society.
A．altered
B．changed
C．adapted
D．revised
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