问题补充：
The children all looked at the broken model plane and felt quite.
A. sad, sad
B. sadly, sadly
C. sad, sadly
D. sadly, sad
答案：
A. sad, sad
B. sadly, sadly
C. sad, sadly
(答案→)D. sadly, sad
解析：第一空look at为动词词组“看”用副词修饰动词；第二空felt为系动词后跟形容词作表语。“孩子们都伤心地看着损坏的飞机模型,感到伤心极了。”所以选D
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