问题
选择题
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
答案
A。
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。