Nowadays Raising pets such as dogs and cats in big cities is

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Nowadays Raising pets such as dogs and cats in big cities is becoming more and more popular
为什么is 后面用的是ing形式呢?还有such as 为什么可以插入句子中间呢.

句子的主语是 raising pets such as dogs and cats in big cities 整个分词短语,当单数看,所以用了is.
pets such as dogs and cats 像猫狗这样的宠物,such as.经常跟着名词之后,表示列举
例如：There are few poets such as Keats and Shelly.像济慈和雪莱这样的诗人现在很少了.
Animals such as rabbits and deer continue to be active all winter,finding food wherever they can .像兔和鹿这样的动物整个冬天都是很活跃的,它们到处寻找食物.

Nowadays Raising pets such as dogs and cats in big cities is In many big cities,many old people keep birds,cats,dogs,and Americans like keeping p_____,such as dogs and cats. 【Cats and dogs are the most popular pets and thought_____mem Dogs are good pets in comparison to cats. (Nowadays there are more and more is some big cities)什么意思英语 The most popular pets are cats and dogs.本题中,如将are改为is,句子如翻译It is raining cats and dogs! cats never become submissive___ 1 as dogs and horses 2 in th the traffic ecpecially in big cities is getting heavier and 首字母填单词Nowadays,it’s common to keep dogs as pets.We can often 英语翻译Many people like to keep animal as pets,like dogs,cats,b