单项选择题

【案例分析题】

M:Have you been working out,Helen?You looks of ull of energy these days.
W:Yeah,as amatter of fact,I‘ve been running every morning for two month snow.

Why does Helen look great? ()

A.She’s come back from a Vacation.
B.She’s rested for two days. 
C.She’s been exercising.

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