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
Sometimes students have great difficulty in ______ facts from fiction and often believe such things exist.
A. telling
B. talking
C. saying
D. speaking
单项选择题
By the time you get back, great changes ______ in this are
a.A. will take placeB. are taking placeC. will have taken placeD. are to take place
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