last week

有毛病。last spring, last year, last month, last July, last week, last Sunday, last night 等虽是名词短语，但是起副词的作用，直接用作状语，不需加介词 in, during 等等。下面列举一些含有 last week, last summer 的例句：

1. Last week I went to the theatre. (New Concept English, Book 2, L. 1) 上星期我去剧院看戏。

2. Last summer, I went to Italy. (New Concept English, Book 2, L.3) 去年夏天我到意大利去了。