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两道英语语法 急The promising young man specializing______biotech is

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两道英语语法 急
The promising young man specializing______biotech is______his way to success.
A.at on
B.in on
C.at in
D.on in
请问这两个空分别是什么用法
There is a real possibility that these animals could be frightened,_______a sudden loud noise.
A.being there
B.there was
C.should there be
D.there having been
请问这到题为什么选C不选D
1 1 specialize in 专攻,精通,以…为专业
on one's way to success:在成功的路上,将要成功
2 这是虚拟语气的省略形式
完整的句子是if there should be a sudden noise
把if去掉,并把句子半倒装:should there be a sudden loud noise
如果突然有一个很大的声音,动物们真有可能被吓到