题目内容
12．The train from Dalian arrives________ about 8：00am．（ ）| A． | in | B． | at | C． | on | D． | to |
分析 从大连来的火车在晚上8点钟左右到达．
解答 答案B．A．in用于表示一段时间，或用于年、月、日、世纪、四季或泛指一天的上午、下午、晚上等．还可以用于表示"从现在起，多长时间以后或多久以后"．C．on主要用在星期几，具体某一天的早上、中午、晚上或节目前．D．to表示方向，意为"到某地"或"朝，向"．B．at多用于表示具体的钟点时刻前，也可用于固定搭配中，表示的时间大多比较短暂．从题中about 8：00am，表钟点，可以判断应选择B．
点评 掌握所供选项的时间介词的含义与用法，不难选出正确答案．
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