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
In mathematics the term solid describes a geometric figure with three dimensions.
A．angle
B．shape
C．triangle
D．equation
单项选择题
______ this coming Thursday, it will be too late to enroll of the course.
A．As of
B．As for
C．As to
D．As on
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