he spoke in such a high voice__at the farther end of the room .as to be heardas to hearto be heard to hear
问题描述：
he spoke in such a high voice__at the farther end of the room .
as to be heard
as to hear
to be heard
to hear
答
to be heard
to 表示目的
be heard表示被听见
答
第三个，因为是被动，被听到
答
第一个~~
答
c
答
as to be heard
such（so）as to 以至于