The Wilsons live in A-shaped house near the coast . It is 17th century cottage. A. the /B

问题补充：

The Wilsons live in A-shaped house near the coast . It is 17th century cottage.

A. the, /

B. an, the

C. /, the

D. an ,a

答案：

A. the, /

B. an, the

C. /, the

(答案→)D. an ,a

解析：第一个空填an 表泛指类别。“一个Ａ字型的小屋里”根据句意第二个句子应是对上文an shaped house 起同位语的用，进一步解释说明，所以还用a表泛指类别。