he is strong enough to carry

答案A
enough修饰形容词,放在形容词的后面．根据“足够强壮”,可推断“能搬动箱子”．固定搭配enough…to…意思是“足够……以致……”．

扩展阅读：the blend 117 ... win server ... house ... these ... he has blue shoes ... you are welcome ... i see your monsters ... there is no game ... agree ...