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The students seemed ---the homework when I went into the cla

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The students seemed ---the homework when I went into the classroom
Ato discuss Bto be successing Cto discussing Ddiscussing
要原因..
B
seem to be discussing
首先,如果没有seem,那么初中知识
when从句一般时,主句现在时
The students were discussing when ...
其次
有了seem to一样的啊,只不过意思变成了 似乎在讨论
并不影响句子时态
第一,seem to do 固定词组
第二,就是像数学一样带进去seem to were discussing,那么根据第一条原则,were变成原型
此外,句子号可以写成It seemed that the students were discussing ...
此外,类似,there be结构 表示有,存在,
那么there seem to be就表示似乎有,一样的
(过去时态就加ed,时态变化也很正常的)
类似be likely to..
都是这么用的啊,