单项选择题

The students was just about to ______ the question, when suddenly he found the answer.

A．arrive at
B．submit
C．work out
D．give up
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单项选择题
My sister' s professor had her______ her paper many times before allowing her to present it to the committee.
A．rewritten
B．to rewrite
C．rewrite
D．rewriting
单项选择题
After briefly ______ the history of the author, Prof. Li turtles to the novel itself immediately.
A．dipping in
B．dipping at
C．dipping into
D．dipping to
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