He cannot be tired _______ he has walked only half a mile.　 (A)：since (B)：whether (C)：when (D)：as long as

He cannot be tired _______ he has walked only half a mile.　
(A)：since
(B)：whether
(C)：when
(D)：as long as

出自：郑州工程技术学院-大学英语1

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