1、The letter they were looking forward to _________ at last。
A. arrived B. arriving C. had arrived D. arrive
对于此题,基础稍差的同学可能选D,认为空格前的 to 是不定式符号,所以后接动词原形;基础稍好的同学可能会选B,知道 look forward to 是短语,意为 look forward to “盼望”,其中的 to 是介词,而不是不定式符号,所以后接动名词;只有基础扎实、语感好、而且细心的同学才会选A,诚如上面所说,look forward to 中的 to 是介词,而不是不定式符号,所以后接动词作宾语时,要用动名词,而不用动词原形。但问题是此句中的动词 arrive 不是介词 to 的宾语,而是句子的谓语。句子的正解分析是:the letter 为句子主语,they were looking forward to 是修饰主语的定语从句(介词 to 的宾语是引导该定语从句的关系代词 that,被省略),arrived 是句子谓语。
2、he professor you referred to _________ just now。
A. comes B. come C. coming D. came
答案选D,句子主语为 the professor,you referred to 为修饰 the professor 的定语从句,空白处填 came,为句子谓语。
3、he theory he sticks to _________ to be of no use in our studies.
A. proves B. prove C. proving D. be proved
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答案选A,he sticks to 是修饰主语 the theory 的定语从句,句子的基本结构为 The theory proves to be of no use in our studies。