“What did you hear last night?”“I seemed___ someone knock at the door.”to hearto have heared答案给的后一个 我知道 have done 是表示 在seem之前发生 但是 这里也没有暗示 一定要强调动作的前后顺序用seem to do

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“Whatdidyouhearlastnight?”“Iseemed___someoneknockatthedoor.”toheartohaveheared答案给的后一个我知道havedone是表示在

“What did you hear last night?”“I seemed___ someone knock at the door.”to hearto have heared答案给的后一个 我知道 have done 是表示 在seem之前发生 但是 这里也没有暗示 一定要强调动作的前后顺序用seem to do
“What did you hear last night?”“I seemed___ someone knock at the door.”
to hear
to have heared
答案给的后一个
我知道 have done 是表示 在seem之前发生
但是 这里也没有暗示 一定要强调动作的前后顺序
用seem to do也完全可以表达句子的意思.

“What did you hear last night?”“I seemed___ someone knock at the door.”to hearto have heared答案给的后一个 我知道 have done 是表示 在seem之前发生 但是 这里也没有暗示 一定要强调动作的前后顺序用seem to do
前面的句子里是last night ,表示时态应该用过去时,并且,后面的是seemed,动作发生在seemed之前,应表示过去的过去,so 答案是to have heared 喽!不知道能不能帮助亲理解呢!