单项选择题

Force is measured in pound ______it is produced.

A．whenever
B．how
C．no matter how
D．although
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单项选择题
______the people directly involved in the tourist industry may benefit, others may find that they are worse off.
A．If
B．But
C．Whereas
D．Whether
单项选择题
Until then, his family______ from him for six months.
A．didn' t hear
B．hasn' t been hearing
C．hasn' t heard
D．hadn' t heard
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