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1. The letter is from my sister, ______is working in Beijing.

A. which

B. that

C. whom

D. who

答案：D. who引导非限制性定语从句，who作从句的主语.

2. In our factory there are 2,000 workers, two thirds of ____are women.

A. them

B. which

C. whom

D. who

答案：C. two thirds of whom 即：two thirds of the 2,000 workers.

3. You're the only person ______I've ever met ______could do it.

A. who; /

B. /; whom

C. whom;/

D. /; who

答案： D. 先行词person后有两个定语从句，第一个从句省略了关系代词whom。因为，whom作从句中met的宾语，可以省略。第二个从句who could do it. who在从句中作主语，不可省略.

4. I lost a book, ______I can't remember now.

A. whose title

B. its title

C. the title of it

D. the title of that

答案：A. whose title引导非限制性定语从句，whose title也可以说成the title of which.

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