Many students have ( ) asleep during the classes at one time or another. ( fall )使用 fall 的适当形式填空. 请再帮忙解释一下时态.

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Many students have ( ) asleep during the classes at one time or another. ( fall )使用 fall 的适当形式填空. 请再帮忙解释一下时态.
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Many students have ( ) asleep during the classes at one time or another. ( fall )使用 fall 的适当形式填空. 请再帮忙解释一下时态.
Many students have ( ) asleep during the classes at one time or another. ( fall )
使用 fall 的适当形式填空. 请再帮忙解释一下时态.

Many students have ( ) asleep during the classes at one time or another. ( fall )使用 fall 的适当形式填空. 请再帮忙解释一下时态.
你的句子有问题.不要告诉我这是书上或者是老师说的标准答案.我已经为你订正好了:
Many students FELL / FALL asleep during the classes at one time or another.
语法:因为fall asleep是at one time or another所发生的,不可能用现在完成时.只能用一般现在时或一般过去时.看来,我的英语落伍了.

fallen,fall的过去分词

Fallen
应该填过去分词 fall-fell-fallen

一楼的回答, 诉我愚昧, 不是很正确。 at one time or another 可以跟现在完成时连用的。