He was able to return .This means he ( )a could if he wanted to b might c could have d did

He was able to return .This means he ( )a could if he wanted to b might c could have d did
He was able to return .This means he ( )a could if he wanted to b might c could have d did

He was able to return .This means he ( )a could if he wanted to b might c could have d did
选A
be able to 的意思就是能够.,有能力 .
和A的意思相符