All the students were sweeping the floor___they heard a man___for help A.when,shouting B.while,to shoutC.when,to shout D.while,shouting

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• All the students were sweeping the floor___they heard a man___for help A.when,shouting B.while,to shoutC.when,to shout D.while,shouting
• 【初二英语】【单选】All the students were sweeping the floor____they heard a man ____ “help”.All the students were sweeping the floor____they heard a man ____ “help”.A.when,shouting B.while,to shout C.when,to shout D.while,shouting
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