1.The girl was often heard ( ) happily in her room.(09 泰安)A.sing B.to sing C.singing D.sings 选C,为什么不选B?2.Your car needs ( ).A.repaired B.repairing C.to repair D.being repaired这题选B,为什么不选C3.The People's Republic

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1.The girl was often heard ( ) happily in her room.(09 泰安)A.sing B.to sing C.singing D.sings 选C,为什么不选B?2.Your car needs ( ).A.repaired B.repairing C.to repair D.being repaired这题选B,为什么不选C3.The People's Republic

1.The girl was often heard ( ) happily in her room.(09 泰安)A.sing B.to sing C.singing D.sings 选C,为什么不选B?2.Your car needs ( ).A.repaired B.repairing C.to repair D.being repaired这题选B,为什么不选C3.The People's Republic
1.The girl was often heard ( ) happily in her room.(09 泰安)
A.sing B.to sing C.singing D.sings 选C,为什么不选B?
2.Your car needs ( ).
A.repaired B.repairing C.to repair D.being repaired
这题选B,为什么不选C
3.The People's Republic of China ( )on Oct.1,1949.
A.found B.was found C.is founded D.was founded
选D,难道found与find的过去式found不一样吗?为什么不是C

1.The girl was often heard ( ) happily in her room.(09 泰安)A.sing B.to sing C.singing D.sings 选C,为什么不选B?2.Your car needs ( ).A.repaired B.repairing C.to repair D.being repaired这题选B,为什么不选C3.The People's Republic
1.hear sb doing sth、不用不定式、这里为被动语态、不是过去进行时、而是现在分词doing作宾语补足语.
2.need doing=need to be done、选C要变成to be repaired.
3.found的过去式是founded、建立成立的意思.find的过去式是found.中华人民共和国建立在1949年10月1号、因此用一般过去式的被动语态.

第一题 过去进行时 她过去在她的房间常常唱歌
第二题 不知道
第三题 is 是现在进行时. 不能搭配过去式.
我读初一的,我根据自己所学的知识解答的.希望可以帮到你.