is often the case with elder people my grandma talked about my new hairstyle for at least

问题补充：

is often the case with elder people, my grandma talked about my new hairstyle for at least 30 minutes.

A. What

B. Which

C. As

D. It

答案：

A. What

B. Which

(答案→)C. As

D. It

解析：考查非限制性定语从句：句意：老人经常是这样的：我奶奶总不停说我的新发型，已经说了至少50分钟。as此处引导非限制性定语从句，指代后面的内容。在定语从句中as做主语，as意为“正如”。选C.