The theory he had stuck _______ to be true.
A．provedB．to provingC．to proveD．to proved
D
一看這四個選項認為是不定式后接動詞原形，其實he had stuck to是充當后置定語，stick to(堅持)為一個固定搭配，去掉這個定語從句后，我們可以很清楚地發(fā)現(xiàn)整個句子缺少了謂語動詞，定語從句時態(tài)為過去完成時，所以主句謂語動詞應(yīng)該過去式。
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