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网上看到RON大神的回复 转贴一下
this isn't a present perfect construction, because it's actually an infinitive. i.e., it's not "they have been equipped"; it's "they appear TO HAVE been equipped".
in any case, you should probably just memorize this construction as a one-off idiomatic structure. if you say "they seemed/appeared to...", then, no matter how remote the event is (in time), you use this construction.
for instance: it seems that the students cheated on the exam (normal past tense in this construction) but... the students seem to have cheated on the exam (not here)
i don't really have a good explanation for this, other than "i'm a writer with a firm command of formal english, and i know that it is so" and "you should just think of it as an idiom". sorry i can't do better than that.
in any case, though, you DO have to use an infinitive after "appear" or "seem" in this sort of construction. and if you think about it, this is as past-tense as an infinitive can get. so that's why you have to use it. |
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