----If a new difficulty , what would we do ?
-----Don’t hesitate to turn to us .
A. is arisen
B. will be arisen
C. arose
D. would arise
网友回答
A. is arisen
B. will be arisen
(答案→)C. arose
D. would arise
解析：句意：如果新的困难出现了，我们该怎么办？--不要迟疑向我们求助。从what would we do ?可知这是和将来相反的虚拟语气的主句，从句应该用过去时或should do，were to do，所以选C。