Question

【题目】—Is this his ruler?
—No, ________.
A.its not
B.it is
C.it isn't

Answer 1

【答案】C
【解析】句意：—这是它的尺子吗？—不。___。be动词所在一般疑问句的否定回答结构是No+主语 +be not，be not必须用缩写形式，故选C。