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

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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.

A C
1.虚拟语气要是.的话,.怎么样
其实更加口语的答案是 would have been working
2.to choose from也是固定搭配,见多几次就熟了

请教：He must have stayed up late last night,_____? A.didn't he wangcheng looked tired because he stayed up late last night I stayed up late last night. He stayed up very late last night , so he feels really (s ) He stayed up late last night,___ a speech for his boss.A.to Do you know why he stayed up so late last night?To prepare f He stayed up late last night,_______(prepare) a long speech Last night he stayed up late to work on his science project是 24.The boy must have stayed up late last night,_____? ----I stayed up late last night for the exam ----_______. A. 怎么造句 I / up / night / because / last/ late/ stayed/ (.) he must have stayed up late night,__he?