单项选择题

Due to ______ beyond the airline's control, all flights out of our hub in Frankfurt have been canceled until further notice.

(A) circumstances
(B) episodes
(C) qualifications
(D) instances
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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
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
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