选哪个选项?为什么?They _____ nothing to help the homeless girl during the last three days.A.have done B.did C.do D.had这里的last three days是过去式的标志吗?
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![选哪个选项?为什么?They _____ nothing to help the homeless girl during the last three days.A.have done B.did C.do D.had这里的last three days是过去式的标志吗?](/uploads/image/z/15118016-32-6.jpg?t=%E9%80%89%E5%93%AA%E4%B8%AA%E9%80%89%E9%A1%B9%3F%E4%B8%BA%E4%BB%80%E4%B9%88%3FThey+_____+nothing+to+help+the+homeless+girl+during+the+last+three+days.A.have+done+B.did+C.do+D.had%E8%BF%99%E9%87%8C%E7%9A%84last+three+days%E6%98%AF%E8%BF%87%E5%8E%BB%E5%BC%8F%E7%9A%84%E6%A0%87%E5%BF%97%E5%90%97%3F)
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