牛羊的食道口线虫主要寄生于牛羊的（）
A.十二指肠
B.空肠
C.回肠
D.真胃
E.结肠
参考答案：E
The Town Hall______in the 1800s was the most distinguished building at that time.[ ]
A. to be completed
B. having been completed
C. completed
D. being completed
随身携带有效的（）合格证。
