题干
Last year my father ______ the city where he was born.
A：visited
B：visits
C：will visit
D：is visiting
答案(点此获取答案解析）
A
Last year my father ______ the city where he was born.
A：visited
B：visits
C：will visit
D：is visiting
的展开式中
的系数是80，则实数
的值是