The children all sadly at the broken model plane and quite sad.A. looked; were leftB. w

问题补充：

The children all sadly at the broken model plane and quite sad.

A. looked; were left

B. were looked; felt

C. looked; were feeling

D. looked; felt

答案：

A. looked; were left

B. were looked; felt

C. looked; were feeling

(答案→)D. looked; felt

解析：

D根据副词sadly可知look是行为动词，表示主动，因此用过去式looked；第二空sad是形容词，因此feel是系动词，没有被动形式，也不用于进行时态。因此只有D项正确。