______his father had come, his face lit up.A、Having learnedB、When he learnedC、

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问题 ______his father had come, his face lit up.

选项 A、Having learned
B、When he learned
C、Heating
D、When learning

答案 B

解析主句的主语是his face，因此，不能用分词短语，只能用状语从句。故B正确。

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