Qian Xuesen devoted all his life to ________________ China’s Space Program. 
#49535
A
develop
B
developing
C
developed
D
develops
推荐题目
It’s time for class. So stop ________, please.
#49374
A
to talk
B
talking
C
talk
D
talked
There is a backpack _________ on the floor.
#50408
A
lying
B
lies
C
lie
D
to lie
Would you like ________ ice cream now?
#50042
A
eat
B
ate
C
eating
D
to eat