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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。
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