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题型:同步题难度:来源:
It"s our duty (责任) _____ old people to cross the road.

A. to help
B. helps
C. to hurt
D. hurts

答案
核心考点
试题【It"s our duty (责任) _____ old people to cross the road.A. to help B. helps C. to 】;主要考察你对不定式等知识点的理解。[详细]
举一反三
He practiced as often as he could _____ his spoken English. [     ]
A. improve
B. improving
C. to improve
D. improved
题型:模拟题难度:| 查看答案
It is important for us _____ a way to stop H1N1.

[     ]

A. find
B. to find
C. finding
D. found
题型:模拟题难度:| 查看答案
Brian asked Danny how _____ a Haiku.
A. writing
B. to write
C. to be written
D. write
题型:同步题难度:| 查看答案
My mother always tells me _____ out alone at night.
A. go
B. not go
C. not to go
D. don"t go
题型:同步题难度:| 查看答案
Do you often help your mother _____ food?
A. cooks
B. to cook
C. cooked
D. cooking
题型:同步题难度:| 查看答案
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