单选题
Without a ______ from a receiver, the delivery person is not permitted to leave the package unattended outside of the building.
(A) recommendation
(B) signature
(C) certificate
(D) stature
A
B
C
D
【正确答案】
B
【答案解析】
[词汇] signature署名
[错误答案] (A)推荐(B)证书(D)(精神、道德等的)高度
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