— Are these skirts thirteen dollars ?— .A. Yes it is . B. No it isn’t . C. Yes these

问题补充：

— Are these skirts thirteen dollars ?

— .

A. Yes , it is .

B. No , it isn’t .

C. Yes , these are .

D. Yes , they are .

答案：

A. Yes , it is .

B. No , it isn’t .

C. Yes , these are .

(答案→)D. Yes , they are .

解析：句意:--这些裙子13美元吗？--是的。上句的主语是these skirts是复数，下文再回答的时候用代词they，故选D。