All the students were sweeping the floor____they heard a man

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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.

A while 表示“同时”
shouting 是进行时,因为听见的时候是正在喊
请及时采纳,多谢!
再问：也有选 when = 就在这个时候（突然）；到底这里是表示两个动作同时发生？
再答： when 和 while 两个词都有同时的意思，而 while 更强调同时一些。你的问题不是太懂。因为你说的不是四个选项之一。那对此题没有什么意义。
再问：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
再答： A D相比，确实要选A. 因为A的意思是正在做一件事的时候，突然发生了另一件事。而D是客观地叙述两件事是同时发生的。这就没能突出主观性来，没有A恰当。

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