单项选择题

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
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单项选择题
The political candidate promptly reorganized his staff ______ his landslide defeat in the primaries.
(A) follows
(B) followed
(C) following
(D) to follow
单项选择题
The Pinnacle Tower, which stands at 111 Broad Street, is the building ______ the accounting firm Finewell & Sons keeps its main office.
(A) what
(B) which
(C) where
(D) who
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