单项选择题

The professor found himself constantly ______ the question: "How could anyone do these things"

A. presiding
B. poring
C. pondering
D. presuming
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单项选择题
Our reporter has just called to say that rescue teams will ______ to bring out the trapped miners.
A. effect
B. affect
C. conceive
D. endeavor
单项选择题
As an excellent shooter, Peter practiced aiming at both ______ targets and moving targets.
A. stationary
B. standing
C. stable
D. still
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