Mr. Chen has a loud voice. His voice can clearly even in that big classroom.A. be heardB

问题补充：

Mr. Chen has a loud voice. His voice can clearly, even in that big classroom.

A. be heard

B. hear

C. be hearing

D. have heard

答案：

(答案→)A. be heard

B. hear

C. be hearing

D. have heard

解析：考查被动语态。主语voice“嗓音”与hear之间是动宾关系，故用被动，只有A项是被动。句意“陈先生是一个大嗓门，甚至在那个最大的教室，他的声音也能被听得很清楚。”故选A。