1.Helen had to shout ________ above the sound of the music.
D.因为Hellen要使自己讲的话被别人听到,所以要用过去分词作宾补,即：make herself heard；又因为make herself heard是shout的目的,所以用不定式.
被动语态不是be + 过去分词麽.
be呢?