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
Astronaut Zhai Zhigang has become the first Chinese_____in space.
#97080
A
walking
B
walked
C
to have walked
D
to walk
________ global temperatures rising, the UN Climate Change Conference was held in Cancun（坎昆）, Mexico last year．
#96412
A
Prevented
B
Preventing
C
Having prevented
D
To prevent
At that time, he spent as much time as he can_____the ancient statues which would be sunk in the river.
#95488
A
paint
B
to paint
C
painting
D
painted