It is not how much we do but how much love we put into what we do benefits our work most.

问题补充：

It is not how much we do but how much love we put into what we do benefits our work most.

A. when

B. that

C. what

D. how

答案：

A. when

(答案→)B. that

C. what

D. how

解析：句意：不是我们做了多少而是我们在我们所做的事情中投入了多少爱对我们的工作最有益。该强调句型强调的是句子的主语，而句子主语是not...but...连接的两个句子。