He asked me if I often heard Jenny ___________ pop spngs in the next room.
问题描述：
He asked me if I often heard Jenny ___________ pop spngs in the next room.
A) sing B) to sing C) singing D) was singing
选什么?为什么?
答
选A
hear有如下两种用法：
hear sb do 听到某人做某事的全过程.
hear sb doing 听到某人做某事的动作.