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
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
He ______ ice-cream on beach ff his father ______ last year, leaving nothing but debts.
A．were to be selling; should die
B．would not be selling; had died
C．would be selling; had not died
D．would not be selling; had not died
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