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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引導(dǎo)非限制性定語(yǔ)從句，who作從句的主語(yǔ).

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. 先行詞person后有兩個(gè)定語(yǔ)從句，第一個(gè)從句省略了關(guān)系代詞whom。因?yàn)椋瑆hom作從句中met的賓語(yǔ)，可以省略。第二個(gè)從句who could do it. who在從句中作主語(yǔ)，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引導(dǎo)非限制性定語(yǔ)從句，whose title也可以說(shuō)成the title of which.

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