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he was able to return.this means he ___ 1 could if he wanted

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he was able to return.this means he ___ 1 could if he wanted to 2 might 3 could have 4 did
选择哪一个,及分别说出每个为什么对与错
he was able to return.this means he ___ 1 could if he wanted
4.was able to do sth意思是成功做到了某事,在这里的意思是he succeeded in returning or he managed to return.所以选4.意思是he returned.
不要用情态动词表示可能性或虚拟,呈现事实.