Question

单句改错(下句有一处错误，请在错误单词的下面划上横线并将正确答案写在句后的横线上)

His sweater is cheaper than his sister. ________

Answer 1

答案：
解析：

sister→sister's 　　his sweater在与his sister's sweater比较，为了避免重复省去了名词sweater，因此应用名词的所有格。