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1.We tried hard to provide visitors ______ the best service.

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1.We tried hard to provide visitors ______ the best service.
A.in B.with C.on D.for
2.______ he could remember everything,three days had passed.
A.When B.Since C.Before D.After
3.This bakery ______ outdated bread to make new products in the past three years.
A.was using B.has used C.had used D.used
B provide ~with~ 给…提供
A When 当~的时候
A 与in the past three years对应,用过去进行时