问题补充：
It’s not how much we do but how much love we put into what we do counts.
A. who
B. which
C. that
D. what
答案：
A. who
B. which
(答案→)C. that
D. what
解析：句意：重要的不是我们付出了多少，而是我们在付出中投入了多少爱。根据句子结构可知，该句为强调句，判断是否是强调句的标准是：去掉强调结构，如果这句话仍然成立，就是强调句，去掉强调句型后，句子为not how much we do but how much love we put into counts。这句话是成立的，所以是强调句。选C.
