单项选择题

The author of the report is well _______ with the problems in the hospital because he has been working there for many years.

A．acquainted
B．known
C．informed
D．accustomed
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单项选择题
As an excellent shooter, Peter practiced aiming at both _______ and moving targets.
A．standing
B．stationary
C．still
D．stable
单项选择题
I understand most of this, but there are still one or two points I should like you to _______ for me.
A．clear away
B．clear up
C．clear out
D．clear off
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