The skirt I bought yesterday is the best one______Ive ever bought.
A.which
B.that
C.what
D.of which

【参考答案】

B
当先行词被形容词最高级修饰时，关系代词只能用that。句意为：昨天我买的短裙是我所有买过的短裙中最好的一个。