AThe monarch butterfly begins Bits life in the northern United States and then Cflew two thousand miles Dto spend the winter in

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问题 AThe monarch butterfly begins Bits life in the northern United States and then Cflew two thousand miles Dto spend the winter in Mexico.

选项 A、 
B、 
C、 
D、 

答案C

解析 Flew is past tense where a present tense verb is needed with the other verb, begins. Correction: flies.
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