Decide which of the choices given below would best complete the passage if i

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问题 Decide which of the choices given below would best complete the passage if inserted in the corresponding blanks. Mark the best choice for each blank on your answer sheet.
Recreational runner Carrie Johnston usually doesn’t feel hungry after a good sweat. Exercise【C1】______ Johnston’s appetite, but she knows she needs to【C2】______ lost calories following a workout.
"When I come home from a good run, I force myself 【C3】______ supper," says Johnston, a dietitian at McMaster University in Hamilton.【C4】______ , Johnston says many female athletes let good eating habits go and risk health【C5】______ thinness. Johnston, who works in the bone-marrow transplant unit at McMaster, has a background in sports【C6】______ In 1997, while a student at the University of Guelph, she worked with Profi Heather Keller on a study for her 【C7】______ on the eating habits of female 【C8】______ .
The【C9】______ person with eating disorders is driven by a desire to look svelte, says Johnston. But her study focused
on athletes who eat less to lower weight and body fat【C10】______ the belief it will improve【C11】______ .
The study involved【C12】______ 22 elite female athletes between【C13】______ 15 and 25 over three months. "Years ago when we didn’ t know any better it was thought that being lighter meant running【C14】______ ," says Johnston, adding that’ s still the mentality of many competitive runners, as well as other【C15】______ like gymnasts and swimmers. Johnstion’ s study【C16】 ______ consumed 400 to 700 fewer calories daily than recommended for their【C17】______ training.
Even when training more, as they got closer to competing, they failed to【C18】______ more food fuel for energy. Initially, race【C19】______ tend to improve when a runner loses some weight, but then they hit a peak and【C20】______ , says Johnston. [br] 【C12】

选项 A、to track
B、to have tracked
C、tracking
D、being tracked

答案 C

解析 tracking 22 elite female athletes，-ing 分词作动词involve的宾语。

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