Do you think it ____to learn English.A、helpful B、helps C、hel

因为think＋it（形式宾语）+形容词或名词（宾补）+不定式／动名词／从句（直接宾语）
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I don't think it possible to master a foreign language without much memorywork．
我认为没有大量的记忆劳动要掌握一门外语是不可能的.
I think it best that you（should）stay here．我想你最好呆在这里.
I think it no use writing to him．我认为给他写信没用.