— Has Tom finished his article on the endangered animals?

— Not yet. He ____ only 200 words by the end of last month. [ ]

A. has written

B. had wrote

C. had written

D. wrote

监察机关立案调查的案件，应当自立案之日起( )内结案。

A．3个月

B．4个月

C．6个月

D．1年