捷豹xf二手车价格16年:帮忙选择啊 还要说明原因 谢了啊
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-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`