--Why has he been staying at home these days?
--He ___________ since a month ago.
A. has been out of work B. was out of work
C. has lost his work D. had left from his work
--Why has he been staying at home these days?
--He ___________ since a month ago.
A. has been out of work B. was out of work
C. has lost his work D. had left from his work
A
答语中有since引导的时间状语，限定了句中的动词为持续性动词。