一道高考语法题,帮忙解释一下
Thepromisingyoungmanspecializing_______biotechis______hiswaytosuccess.A.at...onB.in.....
The promising young man specializing _______ biotech is ______ his way to success.
A.at...on B.in...on B.at.....in C.on...in 展开
A.at...on B.in...on B.at.....in C.on...in 展开
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