单项选择题

______ checks for maintenance are performed regularly, you are not assured of reliable, quality service.

(A) whereas
(B) in case
(C) as long as
(D) unless
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单项选择题
It is my deepest regret that our hotel cannot be responsible for any personal belongings left ______ even within the hotel properties.
(A) responsive
(B) unattended
(C) responsible
(D) careless
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