－What do you think of Peter?
－He is a helpful person. He is always helping people without expecting anything_______.
| A．in turn | B．in return | C．on his turn | D．on the turn |
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－What do you think of Peter?
－He is a helpful person. He is always helping people without expecting anything_______.
| A．in turn | B．in return | C．on his turn | D．on the turn |
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