His English, used to be very poor is now excellent.A. whichB. thatC. itD. whom

网友回答

(答案→)A. which
B. that
C. it
D. whom
解析：
试题分析:考查定语从句。分析结构可知此处是非限制性定语从句，故排除C、D选项，因为that不引导非限制性定语从句。先行词是English，所以用指代物的关系代词which。正确答案是A。句意：他的英语以前很差，现在却非常棒。