Many years of hard work_______ his great success in the development of this new type of material.
A．due toB．thanks toC．contributed toD．looked into
C
本題考查詞義、詞性。本句缺少謂語，應(yīng)選動詞。A項和B項意思都是“由于，因為”，皆為介詞，故可排除；D項意為“調(diào)查，往里看”，語意不通；C項意思是“對……有貢獻(xiàn)，有助于……”,故C項為正確答案。整句意為“這種新型材料的研發(fā)之所以能取得巨大成功得益于他多年的辛苦工作”。
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