问题补充：
---- Was Bill , played basketball very well, helped the blind man cross the road?
------- Yes, of course. He is always ready to help others.
A. it; that; who
B. this; who; that
C. which; that; that
D. it; who; that
答案：
A. it; that; who
B. this; who; that
C. which; that; that
(答案→)D. it; who; that
解析：第一空和第三空是强调句，句型：It is+强调部分+that/who….,强调的是Bill，第二空是定语从句，修饰Bill，用who，因为是非限制性定语从句，不能用that引导定语从句，选D。
