域名被注册有什么坏处:Birds are seldom heard _______at night.

来源：百度文库编辑：中科新闻网时间：2024/04/25 00:52:10

Birds are seldom heard _______at night.
A.sing B.singing
C.to sing D.to be singing

答案为C
感官动词可以接宾语加宾补的结构：感官动词＋sb + do/doing sth.
但感官动词＋sb + do sth.在被动语态中不定式符号to不能省略．题中有seldom,所以主动语态中用原形，被动语态中用to sing .
eg: The boy was last seen playing by the river.(这里last说明看到的是正在进行的动作，所以用v-ing.)

B答案
如they are heard singing in the room!
be heard doing被听到正在干某事

C 差点选了A
heard 不可以省略

Birds are seldom heard _____at night. Birds are seldom heard _______at night. -Why are the birds flying near the ground? If there are ten birds in the tree,I catch qne of them .How many birds left in the tree but for chang they are seldom of interest.帮忙翻译一下,有急用! the bird has flown there are no birds of this year in last's nest there are no birds of this year in last year,s nest It must be morning now because the birds are singing.表述最佳吗？这是一个谚语,请大家帮帮忙:there are no birds of this year in last year's nest 短文改错，2处.And there are bushes behind the house. Mary could always hears birds singing there.