问题补充:
The most important thing we should think about is we should do next.
A. what; that
B. that;that
C. that;what
D. which;what
答案:
A. what; that
B. that;that
(答案→)C. that;what
D. which;what
解析:句意:我们应该考虑的最重要的事情就是接下来我们应该做什么。结合语境可知前文是定语从句,先行词thing前有限定性修饰词The most important,故指物的引导词只能用that。下文是宾语从句,缺少逻辑宾语,故引导词用what,选C。