8．Every evening after dinner，_____ tired from work，I will spend some time reading．（　　）
A．unlessB．ifC．untilD．when

分析 每天晚餐后，如果不累的話，我會讀一些東西．

解答 答案：A．根據(jù) tired from work（上班累了）和I will spend some time reading（我會讀一些東西）可知句義應(yīng)該表示如果不累的話，我會讀一些東西，所以答案是A unless"如果不，除非"，其他選項的含義分別是B"如果"；C"直到"；D"當(dāng)…時"．

點評 考查從屬連詞．
unless是從屬連詞，引導(dǎo)條件狀語從句，含有否定意義，相當(dāng)于if條件狀語從句的否定形式．所以unless=if not．注意：unless引導(dǎo)的條件狀語從句和if條件狀語從句，與其它時間狀語從句一樣，用一般現(xiàn)在時代替將來時．

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