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有道题目:He wanted to go,but he A wasn`t able to Bwasn`t able to

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有道题目:He wanted to go,but he A wasn`t able to Bwasn`t able to go C wasn`t able
couldn`t be able to 帮忙解释一下啊
有道题目:He wanted to go,but he A wasn`t able to Bwasn`t able to
He wanted to go,but he A wasn`t able to Bwasn`t able to go C wasn`t able Dcouldn`t be able to
选A
首先can和be able to不能连用,所以不选D
其次 could通常表示一种婉转语气,而不是can的过去式
要表示过去做了某事,通常用be able to