They went to Beijing ( ) a weekA in B for C after D at哪个,为什么?

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They went to Beijing ( ) a weekA in B for C after D at哪个,为什么?
They went to Beijing ( ) a week
A in B for C after D at
哪个,为什么?

They went to Beijing ( ) a weekA in B for C after D at哪个,为什么?
B
for a week 表示时间段

They flew to Beijing last week