未知题型

Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only _____ to his confusion.
(A) extended (C) added
(B) amounted (D) turned

【参考答案】

是C 题目的意思是尽管他查阅了所有相关资料，但他还是很难理解，而她的解释只增加了他的疑惑。这里add to 是增加......

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Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only _____ to his confusion.(A) extended (C) added(B) amounted (D) turned