题目内容：
He cannot be tired _______ he has walked only half a mile. (A)：since
(B)：whether
(C)：when
(D)：as long as
参考答案：
选择题：He cannot be tired _______ he has walked only half
- 题目分类：郑州工程技术学院-大学英语1
- 题目类型：选择题
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(A)：since
(B)：whether
(C)：when
(D)：as long as