some languages are more difficult to learn than others russi

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some languages are more difficult to learn than others russian ____
A such as B for example Cas well Dand so on

能放在最后的是
B for example
再问： d为什么不行？
再答：因为and so on前面的名词必须在句子中做宾语或者介词短语的宾语，例如 They increased their income by raising sheep and so on.他们通过养羊等方式来增加收入。而原句中主句已经不缺少其它成分了，没有后面的russian for example句子也是完整的，所以用for example这个介词短语做补语

some languages are more difficult to learn than others russi foreign languages ___very difficult to learn 填is还是are as animals think,they learn .some learn more than others. Some hopes are more r_ than others. I think Chinese ___(字) are more difficult to learn than Engl People learn languages to c---with others. Is it more difficult to learn Chinese than learning Janpanes Some stories are more interesting than others.(翻译） Chinese is more difficult language to learn than English.这句句 It___that there are more than seven thousand languages in th Some people are more willing to give help than _____ some days are longer than others