问题补充:
填空:My grandfather used to walk a dog after dinner.My grandfather ___ ___ to walk a dog after dinner.(改为否定句)
答案:
didn use to
时间:2020-03-16 00:48:55
填空:My grandfather used to walk a dog after dinner.My grandfather ___ ___ to walk a dog after dinner.(改为否定句)
didn use to