They are such interesting books ________ students like reading.

A.as

B.that

C.what

D.which

答案及解析： A

解析：

【巧解导析】此句是定语从句，关系代词在从句中充当宾语，故C不正确；

先行词被such修饰时关系代词只能用as，故B，D不正确．