I ______ Peter with his work, but I had a lot of things to do myself.
| A．must have helped | B．should have helped |
| C．needn’t have helped | D．can’t have helped |
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I ______ Peter with his work, but I had a lot of things to do myself.
| A．must have helped | B．should have helped |
| C．needn’t have helped | D．can’t have helped |
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