神马品牌网世界模拟大都市手机版:帮忙选择啊 还要说明原因 谢了啊
来源：百度文库 编辑：神马品牌网 时间：2024/05/01 09:18:17
-When did you first ( )English?
-When I was only 8 years old.
A.learned B.learn C.learning D.learns
-When I was only 8 years old.
A.learned B.learn C.learning D.learns
B
DID助动词
后面用原形
B
did 助动词``后面跟原形`