单项选择题
______ she is a likeable girl, she is very difficult to work with.
A．Since
B．However
C．As far as
D．While
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单项选择题
If she ______ on students for her business, she would have to close her shop.
A．depends
B．should depend
C．had depended
D．depended
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单项选择题
Most environmental problems exist because adequate measures for preventing them ______ taken in the past.
A．was not
B．were not being
C．were not
D．was no to be
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