Such good use had been his spare time his English has improved a lot．
A. made of; as
B. made of; that
C. made in; that
D. found in; as
网友回答
A. made of; as
(答案→)B. made of; that
C. made in; that
D. found in; as
解析：句意为：他如此充分利用他的业余时间以至于他的英语有了很大的进步。第一空考查短语make good use of充分利用；而且使用的是这个词组的被动式，第二空考查句型such...that“如此……以至于……”的用法。所以选B。