单项选择题

______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
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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
单项选择题
Spend the extra dollars to maintain your equipment. Remember, you don't have to brush all your teeth either... only the ones you want to
A．take
B．keep
C．brush
D．leave
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