单项选择题

She was so ______ in her job that she didn't hear anybody knocking at the door.

A．attracted
B．absorbed
C．drawn
D．concentrated
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单项选择题
There are other problems which I don't propose to ______ at the moment.
A．go into
B．go around
C．go for
D．go up
单项选择题
Water enters into a great variety of chemical reactions, ______ have been mentioned in previous pages.
A．a few of it
B．a few of them
C．a few of that
D．a few of which
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