Question

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

Answer 1

A

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。