单选题
Once he set his mind to ______ something, he would not give up easily.
A) do C) be doing
B) doing D) having done
A、
Once he set his mind to ______ something, he would not give up easily.
B、
do
C、
doing
D、
be doing
E、
having done
【正确答案】
B
【答案解析】
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