单项选择题

West Passage Trains customers are ______ to check the schedule frequently because delays, cancellations and other changes can occur.

(A) advise
(B) advising
(C) advised
(D) to advise
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Most participants found the 3-day workshop exhausting ______ very useful for their careers.
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Customers must file car insurance claims ______ 3 months of the date of service.
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