单项选择题

The background music in an assembly line is designed ______.

[A] being not listened to
[B] not being listened to
[C] to be not listened to
[D] not to be listened to
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单项选择题
The travelers ______ their journey after a short break.
[A] recovered
[B] resumed
[C] renewed
[D] restored
单项选择题
Careful surveys have indicated that as many as 50 percent of patient do not take drugs ______ directed.
[A] what
[B] so
[C] which
[D] as
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