—Have you been to the United States?—Yes, only once. I ________ there only for seven days.A.stayedB.had stayedC.have stayedD.was staying
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A解析考查动词的时态。据句子 Have you been to the United States? Yes, only once.我去过美国，但已经回来，所以I ________ there only for seven days是过去的事，所以应用一般过去时态。选A。