英语单项选择 Which do you enjoy————in the summer holidays,swimming

英语单项选择 Which do you enjoy————in the summer holidays,swimming or playing table tennis.
Which do you enjoy————in the summer holidays,swimming or playing table tennis.
A.killing time B.to kill time C.to spend D.spending the time.备注：这是石室中学的一道对外招生考试题,我选的是D,英语高手来.