what particular piece of evidence persuaded the experts that a puma had been seen in the village?

what particular piece of evidence persuaded the experts that a puma had been seen in the village?
这是新概念第三册练习题的问句,我困惑的是 evidence是不可数的,可是不应该是
a piece of evidence吗?难道说 a定冠词可以省略?piece of evidence到底是几个证据?还是一些不定的证据?
英语人气:536 ℃时间:2020-01-31 02:00:21
优质解答
因为有了what修饰,所以a省了.再比如:a kind of car------what kind of car
what piece of evidence是那条证据,是一条.如果是多条,要说:what pieces of evidence
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