---How can I get to the palace Museum (故宫) from here?
---You can take a number 14 bus in front of our school.-How often does the bus leave for the museum?
---________.A.Early in the morningB.In an hourC.Ten minutes laterD.Every half an hour
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D解析此语境中间每隔多久(How often)公交车开往博物馆。every表示“每”；“每隔”，如：every other week每隔一周，每两周。如用How soon(过多久)来提问，则可用B来应答。