Her uncle ___ to New York now, he ___ there twice. He'll be back tomorrow.

阅读下面古诗词，然后完成后面问题。
                                                                                                  浣溪沙

                                                                                                     苏轼
                                                          山下兰芽短浸溪，松间沙路净无泥，萧萧暮雨子规啼。
                                                          谁道人生无再少？门前流水尚能西，休将白发唱黄鸡。

— Who is singing in the next room?

— It        be Lucy. She likes singing at this time.

$△ABC$的三个内角$A,B,C$所对的边分别为$a,b,c$，$a\sin A\sin B+b{\cos }^{2}A=\sqrt{2}a$，则$\frac{b}{a}=$(      )