定语从句练习（附答案详细解析）(3)

14. The book ________cover has a beautiful picture is about nature.
A. which B. whose C. that D. who
15. We’ll graduate but we’ll never forget the days ________ we spend in No. 13 School.
A. when B. that C. where D. what
16. My grandpa likes stories ________ have happy endings.
A. what B. who C. which D. /
17. A WeChat (微信) is an invention ________ can help people talk to friends, share photos, ideas and feelings freely.
A. which B. who C. whose D. how
18. —I’m thinking about those questions ________ you asked me yesterday.
—Really? You must get the proper answers to them.
A. whose B. who C. why D. which
19. He doesn’t like people in the company ___________ talk much but do little.
A. whose B. which C. who D. what
20. WeChat is an invention _________ can help people talk to friends, share photos and ideas freely.
A. who B. what C. which D. whom
21. A true friend is a person ________ reaches for your hand in trouble.
A. whom B. whose C. which D. who