He’s aiming a prize. That is why he puts his heart his work.A. at; ofB. to; offC. for; aw

问题补充：

He’s aiming a prize. That is why he puts his heart his work.

A. at; of

B. to; off

C. for; away

D. at; into

答案：

A. at; of

B. to; off

C. for; away

(答案→)D. at; into

解析：at多表示时间空间上的一点，of表示所有关系

Off 离开、for表示原因目的等，away接动词后表示远离，into进入，根据题意选D，他目的在于一个奖品。那就是他为什么全身心投入到工作中的原因。