Vitamin C helps our bodies make a special chemical, which __________ affects our brains, making us feel happy.
| A．in all | B．in turn |
| C．in advance | D．in short |
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Vitamin C helps our bodies make a special chemical, which __________ affects our brains, making us feel happy.
| A．in all | B．in turn |
| C．in advance | D．in short |
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