1.
(2022高一下·龙江开学考)
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