个人情况：现在F1,毕业时办opt.

1。Are you legally authorized to work in the united states?

这个不确定，问的是现在的情况吧？那么，应该回答no乐？

2.Are you able to present the proper documentation of employment eligibility upon your date of hire?

upon date of hire那时有opt乐，应该回答yes吧

3. Will you now or in the future require sponsorship for employment visa status?

obviously yes