句型转换对划线部分提问,划线部分是（twice）Mr and Mrs White have been to the West Lake twice．
问题描述：
句型转换
对划线部分提问,划线部分是（twice）Mr and Mrs White have been to the West Lake twice．
答
How many times have Mr and Mrs White been to the West Lake.
答
How often have Mr and Mrs White been to the West Lake
答
原句的意思是.White先生和White女士曾经去过西湖两次.
所以应该用 How many times 来提问
所以问句应该是:
How many times have Mr and Mrs White been to the West Lake?
答
How many times have Mr and Mrs White been to the West Lake