母亲的年龄是儿子年龄的四倍,三年前母子年龄之和是49岁,则母亲现在的年龄是多少岁( 发布时间:2017-12-09 18:28 │ 来源:www.tikuol.com 题型:单项选择题 问题: 母亲的年龄是儿子年龄的四倍,三年前母子年龄之和是49岁,则母亲现在的年龄是多少岁( )A.45B.50C.40D.44
题型:单项选择题 The old town has narrow streets and small houses _______ are built close to each other . [ ]A. in which B. where C. what D. that 查看答案