______ is surprising to us is that Tom, for ______ English was once boring, can speak English fluently as though he were a native speaker.A.What; whose B.What; whomC.It; whoseD.As; whom
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B解析试题分析：通过分析句子结构，可知这个句子中包含一个主语从句，和一个非限制性定语从句。且引导词在主语从句中作主语，表示“什么”的含义，故用what。介词 + 关系代词引导的定语从句，指人只能用whom。考点：主语从句和定语从句的考查
点评：解答这类题，首先要确定从句是什么从句，然后依据相应的语法规则答题。名词性从句中引导词的确定，要看它在名词从句中作什么成分，有什么实际意义。定语从句中关系词的确定，要看它在定语从句中作什么成分。当引导词在定语从句中作介词的宾语时，往往可以把介词放在关系代词之前，构成“介词 + 关系代词（whom / which）”结构。做这类考题时，有以下三个注意事项。1. “介词 + 关系代词”引导定语从句时，关系代词只有whom（指人），which（指物）和whose（表所有）。注意不能用who或that，关系代词也不可省略。如：Do you know the girl with whom the English teacher talked just now? 你认识刚才跟英语老师谈话的那个女孩儿吗？2. 关系副词可以用“介词 + 关系代词”来替换。其中，when = at / in / on + which; where = at / in / on + which; why = for which；而关系代词whose常可用“of + which / whom”来替换。如：The house whose doors are green is an office building. = The house of which the doors are green is an office building. 门是绿色的那座房子是办公楼。 3. 含有固定搭配的动词短语，由于其关系紧密，不宜拆分，所以不能将介词置于关系代词之前。这类动词短语有 look after, take care of, listen to, look at, look into, e across, look forward to, break into等。