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

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
A

选a.while后面也要加进行时，shouting表示伴随

选择A
while 表示“同时”
shouting 是进行时，因为听见的时候是正在喊

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