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
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There is an illness that can result in total blindness ________ it is left untreated.
A. unless
B. although
C. but
D. if
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二层入户横支管E轴→C轴处DE50管道长度为()m