定语从句专项练习1.sorry, we dont have the coat _ you need.a. what b. who c. whom d. which2.this is the dictionary _ mum gave me for my birthday.a. which b. what c. whose d. whom3.do you know the man _ is sitting behind nancy?a. what b. which c. who d. whom4.the book _ he bought yesterday is very interesting.a. / b. why c. when d. what5.i have found some pictures of the most interesting places _ you can visit during the winter holidays.a. where b. w