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

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Birdsareseldomheard_______atnight.A.singB.singingC.tosingD.tobesingingBirdsareseldomheard_______atni

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

Birds are seldom heard _______at night.A.sing B.singingC.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.A.sing B.singingC.to sing D.to be singing Birds are seldom heard _____at night.A.sing B.singing C.to sing D.to be singing hea penguins are birds,but they are not l____ most birds. They are birds 写出问句 are the birds in the Where are the birds中文 you are birds and beasts hea的hea是什么意思 hea的hea是什么意思 hea是什么意思 hea是什么意思? hea是什么意思? Birds There are some birds s___in the tree. there are many birds in the sky There are some birds singing( )the trees there are three birds in the