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问题: 高一英语选择题

I was supposed__the work yesterday,but I took a leave the day before yesterday.
A.to finish B.to be finishing C.to have finished
D.to finishing
(我选A,答案却是C,不知为什么~)

__two exams coming near,I have to work really hard these days.
A.On B.Of C.With D.As
(我选的是D,答案是C,不太能分辨这两个词的区别~)

解答:

I was supposed__the work yesterday,but I took a leave the day before yesterday.
A.to finish B.to be finishing C.to have finished
D.to finishing
(我选A,答案却是C,不知为什么~)
回答:应该是C,因为这一“结束”发生在"wassupposed"之前。
__two exams coming near,I have to work really hard these days.
A.On B.Of C.With D.As
(我选的是D,答案是C,不太能分辨这两个词的区别~)
回答:C是对的。此处,coming是动名词,做“two exams ”的宾语补足语,是with引导的方式状语;而as此处是从属连词,必须引导从聚财和呼吁法。