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一道SAT语法题last summer,when mary's aunt and uncle flew from tur

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一道SAT语法题
last summer,when mary's aunt and uncle flew from turkey to visit their relatives and 【tour】 the united states,mary invited sandhya and me to her house to meet them.
这里的tour为什么不用过去时?不应该和flew是平行的么?
一道SAT语法题last summer,when mary's aunt and uncle flew from tur
tour 是和前面的 vist 平行,而不是flew,所以不用过去式.