问题补充：
A knife and a fork on the table.A knife and fork on the table.
A. is; is
B. are; are
C. are; is
D. is; are
答案：
A. is; is
B. are; are
(答案→)C. are; is
D. is; are
解析：通常情况下，由and或both...and连接两个单数形式的名词（词组）作主语时，谓语动词常用复数形式。当并列主语在意义上指同一人、同一物、同一事或同一概念时，谓语动词则常用单数形式。
