单项选择题

I walked down the corridor, my footsteps frighteningly ______ through the empty deserted building.

A. echoing
B. echoed
C. to echo
D. having echoed
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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
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
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