<B><B>是B><B>that">that is whyB><B>还是B><B>which is whyB>B>
<B>&nbsp;B>
请看这样一道题：
<B>He is always really rude, _________ is why people tend to avoid him.B>
<B>A. that&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. it&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C. this&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D. whichB>
<B>【分析】B>此题容易误选 A">A，因为 that">that’s why…是一个常用结构，同学们极易受此影响而选错，当然若此句的空格前有连词 and 或其前的逗号改为分号，则完全可选that（分别构成并列句或两个独立的简单句）。此题的最佳答案是 D，句子后半部为一个非限制性定语从句，which 指 He is always really rude. 另外请比较以下两题（注意连词的有无）：
<B style="mso-bidi-font-weight: normal">(1)B> He had a lot of friends, none of _________ could lend him any money. （选A）
<B style="mso-bidi-font-weight: normal">(2)B> He had a lot of friends, but none of _________ could lend him any money. （选B）
<B style="mso-bidi-font-weight: normal">A.B> whom&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <B style="mso-bidi-font-weight: normal">B.B> them&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <B style="mso-bidi-font-weight: normal">C.B> which&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <B style="mso-bidi-font-weight: normal">D.B> who

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