题目内容：

________ himself in looking after the children,he had little time to finish
A.Occupied B.Occupying
C.Having been occupied D.Being occupied

优质解答

B
Occupy oneself in sth.
专心于…… ,动作由主语he发出,因此用主动形式.
他专心于照顾孩子们,没时间完成……