They heavy rain dropped when we waited ______ the check-in counter of the airport. A. for. B. off. C. out. D. at. 求解释

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They heavy rain dropped when we waited ______ the check-in counter of the airport. A. for. B. off. C. out. D. at. 求解释
They heavy rain dropped when we waited ______ the check-in counter of the airport.
A. for. B. off. C. out. D. at.
求解释

They heavy rain dropped when we waited ______ the check-in counter of the airport. A. for. B. off. C. out. D. at. 求解释
D.at.