题目内容
12._____entering the classroom,remember to take your seat and turn off your cell phone.( )| A. | At | B. | From | C. | Upon | D. | As |
分析 一进入教室,记住就要坐在座位上,关闭手机.
解答 答案选C
at一般用于点钟与地点的前面;from从;upon"在…时;一…就…"讲,;as作连词表示"当…时候"引导时间状语从句.所以要用upon表达"一进入教室,就要…"故选C.
点评 as soon as 与upon的区别:
as soon as是连词,它后面引导的是一个时间状语从句;upon是介词,后加名词(短语)形成介宾短语,结构为upon sb(宾格)/one's doing sth,其中sb(宾格)/one's有时可以省略.
如:I arranged the flowers into the vase as soon as I came back home.一回到家里,我就把花在花瓶里插好.
Upon his arrival,his parents told him the news.他一到来,父母就把这个消息告诉了他.
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