Those postcards were so lovely that they in no time.A. soldB. had been soldC. were soldD.

问题补充：

Those postcards were so lovely that they in no time.

A. sold

B. had been sold

C. were sold

D. have been sold

答案：

A. sold

B. had been sold

(答案→)C. were sold

D. have been sold

解析：句意：这些明信片是如此可爱，以至于他们立刻就被卖光了。从Those postcards were so lovely可知应该是一般过去式，还有postcards和sell是被动关系，用一般过去式的被动，选C。