Question

i don't think ___possible to master a foreign laguage without any___

c it difficulty d it's difficult
说明原因

Answer 1

C。
it +形容词 + to do 结构作形式宾语，any+ 名词，difficulty是名词，difficult是形容词。
全句意思，我不认为掌握一门外语是没有任何困难的。

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Answer 2

i don't think ___possible to master a foreign laguage without any___

c it difficulty d it's difficult

提供的两个选择都不是答案，答案一定是在 A 或是 B了。

正确答案是: it's ....difficulty
句子即是:
I don't think it's possible to master a foreign language without any difficulty.
我不认为掌握一门外语是没有可能不会遇上任何困难的。

很希望会对你有帮助。