B.原本是sit on a chair,此处用it来代指chair,宾语和主语是同一个物体.另个,sit是不及物动词.
B.结构是：have sth.done
A.意思是,在他到车站以前,车就已经走了.所以车离开是在过去的过去发生的事,该用过去完成时.所以,可以排除掉c.d.又因为leave是非延续性动词,不能与段时间连用,故变为be away,所以选A
我保证我的是正确的.
英语题目请详细讲解,请说明原因,最好扩展的讲1.The chair looks very hard ,but it is
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