Even though I’d hurt my leg, I＿＿＿＿＿＿ swim back to the river bank.
A. could
B. might
C. had to
D. was able to
网友回答
A. could
B. might
C. had to
(答案→)D. was able to
解析：can表示能力时可用be able to代替。但can只有一般时和过去时，be able to可用于各种时态。如果表示“过去有能力并成功地做成了某事时，要用was/were able to，不用could。