______for a long time, but he tried his best to catch up with his classmates.A、H

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问题 ______for a long time, but he tried his best to catch up with his classmates.

选项 A、Having been ill
B、Being ill
C、Though he was ill
D、He was ill

答案 D

解析连词题。因为but后面连接的是完整的句子，所以but前面也要连接整个句子。排除A、B。而英文中though和but不能连在一起使用，排除C。因此本题答案为D。

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