They were at the library last week.(对last week提问

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They were at the library last week.(对last week提问

They were at the library last week.(对last week提问
They were at the library last week.(对last week提问

They were at the library last week.(对last week提问
上周是时间,所以用特殊疑问词WHEN.
When were they at the labrary?