All the students were sweeping the floor____they heard a man
All the students were sweeping the floor____they heard a man ____ “help”. A.while;shouting B.while;to shout c.when;to shout D.while;shouts 选出答案的理由要写出来.
有在百度上看到同样的题目,不过选项不同。选的答案是A。 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