是that is why還是which is why

　　是that is why還是which is why

　　請看這樣一道題：

　　He is always really rude, _________ is why people tend to avoid him.

　　A. that B. it C. this D. which

　　【分析】此題容易誤選 A，因為 that’s why…是一個常用結構，同學們極易受此影響而選錯，當然若此句的空格前有連詞 and 或其前的逗號改為分號，則完全可選that(分別構成并列句或兩個獨立的簡單句)。此題的最佳答案是 D，句子后半部為一個非限制性定語從句，which 指 He is always really rude. 另外請比較以下兩題(注意連詞的有無)：

　　(1) He had a lot of friends, none of _________ could lend him any money. (選A)

　　(2) He had a lot of friends, but none of _________ could lend him any money. (選B)

　　A. whom B. them C. which D. who

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