题目内容
从所给的四个选项中选择最佳答案
By the time he was six, the boy ______ 200 English words
.[
]A
.learned B.had learnedC
.has learned D.was learning
答案:B
练习册系列答案
相关题目
题目内容
从所给的四个选项中选择最佳答案
By the time he was six, the boy ______ 200 English words
.[
]A
.learned B.had learnedC
.has learned D.was learning