He will finish writing the article when he _____ enough time next week.[ ]

A. is

B. are

C. has

D. have

兽用生物制品经营企业不允许经营（）。

A.鸡球虫疫苗

B.口蹄疫疫苗

C.鸡传染性支气管炎疫苗

D.仔猪副伤寒疫苗