C
is caused 是一般现在时的被动语态,与题意不符.
has caused 是现在完成时,主动语态,符合题意.
题意：听摇滚音乐会上高声的音乐已导致一些青少年听力丧失.
一道英语选择题,求解!Listening to loud music at rock concerts ____ cau
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