His wife, to whom he _____ for 20 years, died of cancer last Thursday. （ ）
A：had married
B：has been married
C：has married
D：had been married
下列关于细胞结构与功能关系的描述中，错误的是（ ）
催化唾液淀粉酶水解的酶是（ ）
在《红楼梦》第九十回中，贾母说：“自然先给宝玉娶了亲，然后给林丫头说人家。再没有先是外人，后是自己人的……”。这反映出贾母
