南京二手印刷设备:Birds are seldom heard _____at night.

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

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 .答案为C
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.)

C
你的这个问题和notice sb do 变为被动语态一样，
要把省去的 to 还回来。

hear sb do
watch sb do
see sb do
make sb do

一样

C
这是被动语态,动词不定式不能省to
hear sb. (to) do sth.

C
hear sb do sth 句型用于被动要还原to
没有必要用进行时

sing

C
这里讲的是一种经常的状态，所以应该用hear sb do sth的结构，改为被动后，就要在sing前面加to

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.