John promised to keep his mother______of how things were going on when he studie

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问题 John promised to keep his mother______of how things were going on when he studied in England.

选项 A、to be informed
B、to inform
C、informed
D、informing

答案 C

解析固定搭配题。keep sb．+动词过去分词，表示让某人处于某种状态。本句表示“让某人了解，让某人知道”。

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