单项选择题

When she returned back by abroad, she told us all about her experience as an illegal immigrant.()

A. by
B. back
C. from
D. back from

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单项选择题
When Henry arrived home after a hard day at work, his wife was slept.()

A. his wife was sleeping
B. his wife slept
C. his wife has slept
D. his wife has been sleeping
单项选择题
Machines that use hydraulic pressure including elevators, dentist chairs, and automobile brakes.()

A. exclude
B. excluding
C. include
D. are included
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