993.People in Chongqing are proud of ____ they have achieved in the past ten years.
A.that
B.which
C.what
D.how
994.Some children want to challenge themselves by learning a language different from ____ their parents speak at home.
A.what
B.that
C.which
D.one
993.答案是C；what引导名词性从句，同时充当achieved的宾语。
994.答案是A；句中的from缺少宾语，what既引导了宾语从句，又充当了speak的宾语。
