单项选择题

Her husband and her eldest son had been killed______.

A. many years before
B. many years since
C. many years ago
D. many years from now
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单项选择题
Television was not invented by any person, ______ into being overnight.
A. nor did it spring
B. nor does it spring
C. nor has it sprung
D. nor can it spring
单项选择题
While a computer cannot replace an instructor, it can take over many tasks to lessen the usual burden of the instructor.
A. routine
B. serious
C. generalized
D. compulsory
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