A bird was heard __________in the tree just now.A.singing B.sing C.to sing D.sang

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A bird was heard __________in the tree just now.A.singing B.sing C.to sing D.sang

A bird was heard __________in the tree just now.A.singing B.sing C.to sing D.sang
A bird was heard __________in the tree just now.
A.singing B.sing C.to sing D.sang

A bird was heard __________in the tree just now.A.singing B.sing C.to sing D.sang
很高兴能帮你解答.
答案:C
解析:当hear sb.do/doing sth.用在被动语态时要用to,即sb.be heard to do sth.

楼上同学的答案我不敢认同 这题当选A
从语法上讲答案只可以是A或者B 又根据本题的时间状语-- just now 所以应该用进行时 所以此题选A