单项选择题

Women workers wear hats ______ their hair gets caught in the machine.

A．if
B．in case
C．unless
D．because
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单项选择题
Building the new house ______ the family as many as twenty thousand dollars.
A．takes
B．spends
C．pays
D．costs
单项选择题
Sometimes students have great difficulty in ______ facts from fiction and often believe such things exist.
A．telling
B．talking
C．saying
D．speaking
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