题目:Mr. Wang wrote a book on teaching when he was________.
A. sixties
B. in sixties
C. in the sixties
D. in his sixties
答案:评论后可见此内容
推荐使用我们的公众号搜索题目,题目更全,检索更方便。支持语音、图片、文字等多种搜索方式。