1.the music is often heard _______on the radio A.to play B.playedC.to be played D.playing
问题描述：
1.the music is often heard _______on the radio A.to play B.playedC.to be played D.playing
2.birds are seldom heard _______at night
A.sing B.singing C.to sing D.to be singing
3.being done能不能放句首作主语或状语
答
同学你好,答案依次是：AB能.如:He was seen come into the book store就是错的He was seento come into the book store正确.在主动语态中,有时可以加不带to的不定式作宾语.但如果变为被动语态时,则要将省略的to还...