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提问:坐等急!Is Mr Morrison in his office now?Ihave aquestuon for

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提问:坐等急!
Is Mr Morrison in his office now?Ihave aquestuon for him.
Sorry.Idon't know.When i______ his office.he was not there.
A got to B had reached C arrived D had arrived at
B 、D选项有什么区别?正确答案是什么呢?
A
B,D没有区别,不过因为这里不应用过去完成时,而应用过去时,所以选A