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
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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
单项选择题
Some people viewed the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer remained ______.
A. to be shown


B. to have been shown
C. to have shown


D. being shown
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