Play, often ______ as an activity for younger children, is still important in the social development of teenagers.
#92505
A
to see
B
seeing
C
seen
D
to be seen
推荐题目
The teacher apologized          late.
#96239
A
to his students to arrive
B
to his students for arriving
C
at his students to arrive
D
at his students for arriving
We don’t allow _______in the office.But you are allowed _____ in the rest room.
#96638
A
smoking; smoking
B
to smoke; to smoke
C
smoking; to smoke
D
to smoke; smoking
The old man, ____________abroad for twenty years, is on the way back to his motherland.
#98541
A
to work
B
working
C
to have worked
D
having worked