题目内容
改错
He has become interested in stamp collecting for many years．
become→been
单句改错
He has learnt enough German to carry out a conversation．
Correction(单句改错)
He has served the army for five years．
He has devoted all his life to protect the rare animal, South China tiger．
He has already been used to get up early．
He has two sons, each of them looks like him．
