题干
Today we focus on _____ is called recurrent obesity (复发性肥胖) or yo-yo obesity (溜溜球式肥胖), _____ is the phenomenon _____ we gain weight and then go on a successful diet, but within 12 months we go back to our original weight.
| A．what; which; in which | B．which; which; where |
| C．all; that; that | D．whatever; as; which |
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