He walked directly towards her, and spoke to her in a low voice to avoid by others.
A. to hear
B. hearing
C. to be heard
D. being heard
网友回答
A. to hear
B. hearing
C. to be heard
(答案→)D. being heard
解析： 非谓语动词。考查avoid doing sth 避免做某事。故排除A C项，再根据题意，他直接走向她，小声跟她说话，避免其它人听到。故选D项。
考点 非谓语动词。