问题补充：
The professor kept telling us that the future to the well-educated and I kept wondering where I of it.
A. would belong; heard
B. belonged; had heard
C. was belonged; heard
D. was belonging; had heard
答案：
A. would belong; heard
(答案→)B. belonged; had heard
C. was belonged; heard
D. was belonging; had heard
解析：考查belong to的用法和时态，第一空填belonged，因为belong to不能用进行时和被动，第二空填had heard表示在教授讲之前我在哪听过的。句意是：教授一直告诉我们未来属于受过良好教育的人，我一直在想在哪里听过的。选B。
考点; 考查固定词组和时态
