单项选择题

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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
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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