while和when谁用在句首谁用在句中 what happend （） Linda was on the telephone填什么,为什么呢,

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• while和when谁用在句首谁用在句中 what happend （） Linda was on the telephone填什么,为什么呢,
• while和when谁用在句首谁用在句中 what happend （） Linda was on the telephone填什么,为什么呢,
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• My mother was cooking___.What were you doing ___?A.at that time B.when the telephone rang