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His grandson’s bicycle needs ______.

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His grandson’s bicycle needs ______.
A)to repair B)repairing C)repaired D)have repaired
2.用正确的动词形式填空
He asked if his mother’s operation ______(be)successful.
3.改写句型
I didn’t look up the word in the dictionary,so I couldn’t explained it.
If I ______ ______ up the word in the dictionary,I could have explained it.
请说明原因,
His grandson’s bicycle needs ______.
1)B.need+doing=need to be done(主动表被动)
2)had been.(原因嘛 其实我也说不清,但是事发生在过去的过去,应该用过去完成时把,至于是不是虚拟语气我也说不清)
3)had looked是虚拟语气