She was just ________ to open the window to let fresh air in, ________ she saw the lion.A.about, whileB.going, whenC.going, whileD.about, when
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D解析be about to do sth…when结构，表示“正要做某事时”，“马上要做某事，就在这时”。此时when是并列连词，它引导的句子须放在后面。又如：He was about to tell everything when his father came back.