单项选择题

Lost and found items can be picked up in person with the owner's ID ______ regular hours of operation from Monday through Friday.

(A) while
(B) during
(C) as
(D) on account of
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单项选择题
Any customers not ______ content with our services are entitled to a full refund or an instant replacement
(A) completed
(B) completion
(C) complete
(D) completely
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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