We had learnedhad learned (learn) 4 units by the time he returned from his illness.
【考點】過去完成時.
【答案】had learned
【解答】
【點評】
聲明:本試題解析著作權屬菁優(yōu)網所有,未經書面同意,不得復制發(fā)布。
發(fā)布:2024/4/20 14:35:0組卷:3引用:2難度:0.8
把好題分享給你的好友吧~~