It’s sometimes too difficult to understand the voices of American film.A. heavyB. hardC. c

问题补充：

It’s sometimes too difficult to understand the voices of American film.

A. heavy

B. hard

C. confusing

D. confident

答案：

A. heavy

(答案→)B. hard

C. confusing

D. confident

解析：句意： 有时理解美国电影的发音太困难了。A.heavy 重的；B.hard困难的，艰苦地，努力地；C.confusing糊涂的；D.confident自信的。difficult 困难的。故选B。