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
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.)
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.)
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