To make us healthier, the teachers often see us ______ on the playground. 
#49764
A
took exercise
B
take exercise
C
take exercising
D
to take exercise
推荐题目
The film ________ by Spielberg is worth _______.
#48536
A
was directed; seeing
B
directed; seeing
C
was directed; to see
D
directed; to see
I saw them ___football on the playground when I passed by.
#49063
A
playing
B
were playing
C
played
D
to play