—Must I go and repa
—Must I go and repa
| —Must I go and repair our TV set this afternoon? —No,you _______.I've repaired it. | [ ] |
| A.mustn't B.needn't C.shouldn't D.wouldn't |
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在△ABC中，角A、B、C所对的边分别为a，b，c，且 3 asinB=bcosA．
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