sometime it's diffcult __________ the teacher because of the buses
怎么填 1.hear 2.hearing 3.to hear 4.to listen
说明理由
人气：243 ℃ 时间：2020-05-19 19:08:10
解答
3.to hear
因为汽车（的干扰）,有时很难听清老师的话.
it 是形式主语.It is difficult to do sth.做…… 很难.
listen 是不及物动词.需加 to
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