题文
What can we do for them _____ for all the help they have given us?
| A．in turn |
| B．in return |
| C．by turns |
| D．out of turn |
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What can we do for them _____ for all the help they have given us?
| A．in turn |
| B．in return |
| C．by turns |
| D．out of turn |
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