With an appropriate preposition: _______hearing the good news, they jumped with joy.

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问题 With an appropriate preposition:
_______hearing the good news, they jumped with joy.

选项

答案On

解析 on(one’s)doing意为“当……时”,相当于when引导的时间状语从句。如On(my)asking for information,I heard a loud noise outside。答案为On。
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