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Thesymptomsofflumaybeunpieasant,buttheydisappearwithinafewdays.该句中Thesymptomsofflumaybeunpieasant,buttheydisappearwithinafewdays.该句中disappear为什么不用过去式?

题目详情
The symptoms of flu may be unpieasant,but they disappear within a few days.该句中
The symptoms of flu may be unpieasant,but they disappear within a few days.该句中disappear为什么不用过去式?
▼优质解答
答案和解析
用一般现在时表示将来,表示肯定会在几天内消除这个症状
于过去式无关