Li Ling was a diligent boy . He go to school though it was raining hard .
A. was able to
B. could
C. couldn''t
D. wasn''t able to
网友回答
(答案→)A. was able to
B. could
C. couldn''t
D. wasn''t able to
解析：表示过去“能够”，肯定句只用 was able to , 不用 could。而 couldn''t 与 wasn''t able to 在语言逻辑上都不妥。