单项选择题

I felt somewhat disappointed and was about to leave, ______ something occurred which attracted my attention.

A. unless
B. until

C. when

D. while
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单项选择题
Television was not invented by any one 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
A rogue loose called a hacker could take control of the entire system by implanting his own instructions in the software and then he could program the computer to erase any sign ______.
A. of his being ever there

B. he ever has been there
C. of his having ever been there
D. of him having ever been there
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