单项选择题

______ how to deal with the trouble of the computer, Martin had to ask his brother for help.

A．Not know
B．Not known
C．Not to know
D．Not knowing
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单项选择题
The chair looks rather unusual in shape, but it is very comfortable to sit ______.
A．by
B．on
C．with
D．at
单项选择题
______ Susan gets onto the top of a tall building, she will feel very much frightened.
A．Now that
B．Even though
C．Every time
D．Only if
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