Thefarmerswereworkingonthefarm___

发布时间：2020-07-11 08:00:50

The farmers were working on the farm _________ they saw something strange _________ towards them in the sky．













A.when; flew












B.when; flying











C.while; fly











D.while; flying

网友回答

B解析前一空用when作并列连词，表示“正在这时”，后一空用现在分词形式作宾语补足语，表示动作正在进行。
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