(On) seeing the boy (fell) into the river, she (sprang) to her feet and (went to) the rescue.

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问题 (On) seeing the boy (fell) into the river, she (sprang) to her feet and (went to) the rescue.

选项 A、On
B、fell
C、sprang
D、went to

答案B

解析 考查动词的用法。see sb. do sth.表示“看见某人正在做什么”,see sb. done sth.表示“看见某人做过某事”。
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