1.then arose the question ____ we were to get so much money.
2.this the house ____ the great man mao zedong was born 110 years ago.
a. where b. that c. about which d. in which
解析：答案分別是1.a 2.a/d。先行詞與where, when概念一致時，是定語從句，2題中的house與where同表地點，且這個關係副詞where或when可以用“介詞+which”的形式代替，所以答案a 和d都可以引導。1題中的question與where不表同一概念，可見是同位語從句，所以where不能改用“介詞+which”的形式。