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All the students ______ the floor ________ they heard a man ________“help”. A. were sweeping；when; s...
题目内容：
All the students ______ the floor ________ they heard a man ________“help”.
A. were sweeping；when; shouting B. swept; while; to shout
C. swept; when ; to shout D. was sweeping ;while; shouting
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