单项选择题

Just as the value of a telephone network increases with each new phone ______ to the system, so does the value of a computer system increase with each program turned out.

A. adding
B. to have added
C. to add

D. added
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单项选择题
When Mohammed, a friend of mine from the Middle East, first went to the United Kingdom to attend the university, ______ with women in the same class.
A. he’d never before studied
B. he would never before study
C. he couldn’t before study
D. he hasn’t before studied
单项选择题
Scientists generally agree that the earth’s climate will warm up over the next 50 to 100 years ______ it has warmed in the 20000 years since the Ice Age.
A. as long as


B. as much as
C. as soon as


D. as well as
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