【題目】Tom was attacked by a crocodile while(swim) across the river.

【答案】swimming
【解析】句意：湯姆在小河中游泳時被一只鱷魚攻襲。前面有謂語動詞was attacked，這里用非謂語結(jié)構(gòu)，前后主語一致，省略主語和be動詞。湯姆和游泳是主動關(guān)系，用現(xiàn)在分詞，因此填swimming。

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