问题补充：
The beautiful coat by her last month.
A. is designed
B. is designing
C. was designed
D. was designing
答案：
A. is designed
B. is designing
(答案→)C. was designed
D. was designing
解析：根据last month，要用一般过去时；且coat和design之间是动宾关系，要用被动语态。所以选C, 一般过去时态的被动语态。
