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
Unless ___ to speak,you should remain silent at the conference. 
#94186
A
invited
B
inviting
C
being invited
D
having invited
In April,thousands of holidaymakers remained________abroad due to the volcanic ash cloud.
#94216
A
sticking   
B
stuck
C
to be stuck
D
to have stuck
We’re so much looking forward ____________ you again.
#96233
A
to see
B
to seeing
C
at seeing
D
for seeing