两道英语语法 急

题目

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

答案

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 sudd...