All the teachers and students were tired when they ________ the top of the mountain.A.gotB.arrivedC.climbedD.reached
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D解析剖析：要表达“到达山顶”英语可以是reach/arrive at/get to the top of the mountain．A、B项中的get和arrive均是不及物动词，若后接表示地点的名词，必须加介词，均应排除．C项climbed是“爬”的意思，“爬到”应为climb up；reach表“到达”是及物动词，可以直接跟表示地点的名词作宾语．