Cadets have to_____99 credits for graduation, compared to the average of 30 credits at most local universities.

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问题 Cadets have to_____99 credits for graduation, compared to the average of 30 credits at most local universities.

选项 A、completed
B、completing
C、completion
D、complete

答案D

解析空格前有助动词have to，因此空格内应填入动词原形complete。

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