When salesmen are doing well, there is pressure upon them to begin ______ better, for fear they may start doing worse.
A、
did
B、
done
C、
doing
D、
do
【正确答案】
C
【答案解析】
begin后跟to do和doing两种形式。begin to do指停下某事去做另一件事，begin doing sth.指开始做某事。答案为C。
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