Even though I’d hurt my leg, I＿＿＿＿＿＿ swim back to the river bank.
A．couldB．mightC．had toD．was able to
D
can表示能力時(shí)可用be able to代替。但can只有一般時(shí)和過去時(shí)，be able to可用于各種時(shí)態(tài)。如果表示“過去有能力并成功地做成了某事"時(shí)，要用was/were able to，不用could。
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