Peter had lost his job, and the family was ________ a very difficult time.

A．going off

B．going through

C．going out

D．going down

有一工作，甲做2天后乙接着做，做了10天后完成了工作。已知乙单独完成需要30天，那么甲单独完成此工作需要几天

A．3天

B．1天

C．10天

D．2天