单项选择题

There is nothing serious ______ I am concerned. I had jumped out of the window when the bomb exploded.

A．as well as
B．as
C．as long as
D．as far as
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单项选择题
This kind of material can ______ heat and moisture.
A．delete
B．compel
C．constrain
D．repel
单项选择题
I didn't ______ that these days he was especially busy.
A．pay attention to
B．notice
C．recognize
D．guess
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