It was requested that passengers ________ smoke during the flight.
A. not
B. need not
C. could not
D. will not
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Scholars and gurus re-interpreted them all the time, but one could always go back to the original ________.
A. file
B. version
C. context
D. devotion
There is an illness that can result in total blindness ________ it is left untreated.
A. unless
B. although
C. but
D. if
二层入户横支管⑨→⑦轴处DE20管道长度(含垂直段)为()m