单项选择题

All factory workers are required to report to the auditorium ______ Tuesday morning for an auxiliary training session.

(A) on
(B) of
(C) at
(D) in
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单项选择题
No one will be admitted to the briefing room during Ms. Palmer's speech, so it is important that you arrive prior ______ the scheduled start time of 3:30.
(A) to
(B) than
(C) from
(D) at
单项选择题
Employees are encouraged to support the greening of the home office in ______ ways they feel most comfortable.
(A) whenever
(B) whichever
(C) however
(D) wherever
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