单项选择题

I was ______ in my reading, and didn't at first hear the doorbell ring.

A．immured
B．immersed
C．busy
D．infatuated
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单项选择题
Those who let uncertainty ______ rarely achieve much.
A．turn them down
B．send them down
C．weigh them down
D．huddle down
单项选择题
______popularity of subject matter and frequency of use, the books on the two middle shelves will be the most helpful to you.
A．As of
B．As regards
C．As from
D．As against
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