填 it 或it is 都是正确的.
填it,则是 think+it+形容词+to do sth 句型,it 是形式宾语,真正的宾语是后面的不定式 to do;
填 it 则 think （that）it is +形容词+to do sth 句型,that）it is +形容词+to do sth 是宾语从句.
1 I think _____necessary but not easy to keep the traditiona
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