the experts were now fully convinced that the animal was a puma,but where had it come from?As no pumas had been reported missing form any zoo in the countrybut where had it come from?这里的had为什么要用过去完成时呢 ,而且come from这

The experts were now fully convinced 句中为何加were 做什么成分 新概念3第一课中有句话不明白,the experts were now fully...为什么now可以用于一般过去时?好纠结啊原句是 the experts were now fully convinced taht the animal was a puma.是第一课的 the experts were now fully convinced that the animal was a puma.这是定语从句还是状语从句啊? the experts were now fully convinced that the animal was a puma.后面的从句为什么was啊?虚拟语气么 英语提问：副词在以下句子中的位置能否进行如下调整.原句：Now experts were sure that the animal really was a tiger.改句1：Experts were now sure that the animal was really a tiger.(now,really均放be动词之后）改句2： 英语提问：以下句子中的副词可以进行如下位置变换吗?原句：Now experts were sure that the animal really was a tiger.改句1：Experts were now sure that the animal was really a tiger.(now,really均放be动词之后）改句2： experts were convinced that the animal was a puma.experts were convinced 是被动么?that 后面 是 什么从句? the experts were now fully convinced that the animal ___a puma1 must be 2 should have been 3 can only be 4 could only have been请问选择哪一个,及分别说出每个为什么对与错课文里面有一句话The experts were fully convinced that by now 的用法The experts were now fully convinced that the animal was a puma .这句话中NOW ,事情发生在过去,.After acrossing the Equator ,the caption called in at a portto have a now rudder fitted.but by now the Thermopylae was over fiveh 英语翻译The upside is the possibilities contained in knowing that everything is up to us; where before we were experts in the array of limitations,now we become authorities of what is possible. 句子结构The experts were now fully convinced that the animals was a puma后面的that引导的是一个宾语从句还是that 仅仅作为一个连接词呢 新概念上的一道选择题The experts were now fully convinced that the animal_______a puma.A.must be B.should have been C.can only be D.could only have been可能是多项选择,是A和D么 Were the experts sure that the animal was a puma?Why? were you in the supermarket just now? 英语提问：句子结构分析,急!What was the problem the experts were unable to solve?麻烦详细点,新手. 新概念英语中的几个问题~第三册中有这个题目：The experts were now fully convinced that the animal ____ a puma A.must be B.should have seen C.can only be D.could only have been.我选择是是A 但答案是D为什么啊还有个.The the experts were now fully convinced that the animal was a puma,but where had it come from?As no pumas had been reported missing form any zoo in the countrybut where had it come from?这里的had为什么要用过去完成时呢 ,而且come from这 1 （）,it immediately ran away.a.Observing her b.On being oberved c.Having been oberved d.On her being oberverd2 The experts were now fully convinced that the animal ( ) a puma.a.must be b.should have been c.can only be d.could only have been