A set of keys on the table. Can you see .A. is itB. is themC. are itD. are them

问题补充：

A set of keys on the table. Can you see .

A. is, it

B. is, them

C. are, it

D. are, them

答案：

A. is, it

(答案→)B. is, them

C. are, it

D. are, them

解析：句意：桌上有一串钥匙，你能看见它们吗？A set of keys 意为“一串钥匙”，其中心词为A set,所以其后谓语动词用单数is；第二空看见的是钥匙而不是钥匙串，钥匙为复数，故代词用复数them,故选B.