单项选择题

Charles Babbage is generally considered ______the first computer.

A．to have invented
B．inventing
C．to invent
D．having invented
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单项选择题
role she played in the film! No wonder she has won an Oscar.
A．How interesting
B．How an interesting
C．What interesting
D．What an interesting
单项选择题
The old couple have been married for 40 years and never once ______with each other.
A．they had quarreled
B．they have quarreled
C．have they quarreled
D．had they quarreled
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