问题
选择题
He got completely ____ when he saw both Lucy and Lily, who are twin sisters. [ ]
A. confusing
B. confused
C. confuse
D. confuses
答案
答案：B
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He got completely ____ when he saw both Lucy and Lily, who are twin sisters. [ ]
A. confusing
B. confused
C. confuse
D. confuses
答案：B
、
、
、
，它们互称为同位素