The children talked so loudly at dinner table I had to struggle .A. to be heardB. to have

问题补充：

The children talked so loudly at dinner table I had to struggle .

A. to be heard

B. to have heard

C. hearing

D. being heard

答案：

A. to be heard

B. to have heard

C. hearing

D. being heard

解析：

由句意知，我提高嗓门是为了让别人听清我的话。主语I和hear之间为被动关系，故要用被动语态，可以排除B、C两项，D项being heard不作目的状语。动词不定式在句中可作状语、主语、宾语、表语、定语等，是非谓语动词中的重要项目，不定式作目的状语时，要注意不定式动词和主句主语之间的关系，即to do和to be done形式的主动和被动意义。