单项选择题

Complicated ______ it is, the problem can be solved in only 2 hours with an electronic computer.

A．like
B．as
C．however
D．even if
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单项选择题
He gave his work to his friend to ______ , because he found it hard to see his own mistakes.
A．adjust
B．compile
C．revise
D．verify
单项选择题
Please excuse me if I have left any of my questions ______
A．to be unanswered
B．not to answer
C．unanswered
D．being unanswered
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