Dr Carl is an expert the environment. A. aboutB. on C. over D. of——青夏教育精英家教网——

题目内容

Dr Carl is an expert ______ the environment.

A. about
B. on
C. over
D. of

试题答案

B

相关题目

Dr Carl is an expert ______ the environment.

A. about
B. on
C. over
D. of

查看习题详情和答案>>