若题目问What's the value of x?条件1 得:x=-1 或 x=1
条件2 地:x=-1 或 x=2
这时候是选 C 还是 D , 即十分要求the value of x 唯一
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
抱歉友友们,上面有俩错别字
若题目问What's the value of x?
条件1 得:x=-1 或 x=1
条件2 得:x=-1 或 x=2
这时候是选 C 还是 D , 即是否要求the value of x 唯一
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.