1.If he hadn't stayed up late last night,he____in the office

1.If he hadn't stayed up late last night,he____in the office with us now.
A.would have worked B.will work C.is working D.would work
2.To test which foods are better for a long space journey,the astronauts in Shenzhou VI had as many as 50 dishes______.
A.to choose B.to be choosen C.to choose from D.to be choosen from.
望能详细说明下其他选项不选的原因,第一道我选C,第二道我选A,但为什么都不对,很疑惑.