单选题
He sat down beside Christina, feeling the warmth of the sun against his face, ______ to relax for the first time in days.
【正确答案】
A
【答案解析】[解题指要] 该题测试形容词短语able to do 用作状语，表主语的状态的用法。D选项able前可认为省略了being一词。类例：The boy hurried back home，full of joy．B选项was able前应加用连词and。C选项enable是动词，语法有误，故不用。