at heart/in the heart

【问】 He's sometimes bad-tempered but he's a good fellow ____.

A. in heart B. with heart

C. at beart D. by heart (Nelson. 500A)

答案为C(at heart)。这是否意味着heart不能与in搭配?

【答】 in可以与heart搭配，但是heart之前一般带定冠词或物主代词：in the [his] heart。inthe heart与at heart的意义是不同的。at heart是指：“内心里”、“实际上”、“实质上”(见heart¹)。而in the heart“在心里”、“在…中心”。请看下面的实例：

1. At heart he is a simple，generous fellow. (Whitford)

他实际上是一个纯朴、慷慨的人。

2. He could not bring himself to say what was in his heart.(Maugham)

他不能使自己说出心里的话。

3. The insurance company occupies a 20-story building in the heart of the city. (URW)

保险公司在市中心占有一栋20层的大楼。

请做下面的英语试题：

You should have the interest of the collective_________.

A. at heart B. by heart C. in heart D. on heart