核心问题
X-rays are able to pass through objects and thus make ____ details that are otherwise impossible to observe.
A. it visible B. visibly C. visible D. they are visible
答案为 C(visible)。但 visible 是什么成分呢？它的位置使我难以理解。
词典解答
在一般的情况下,宾语补足语位于宾语之后,例如:
Most people consider these books rather expensive. (CGEL) 大部分人都认为这些书有点贵。
但是，当宾语较长而宾语补足语较短时，常常打破正常的SVOC的语序，而采用SVCO的语序。这是符合英语的“尾重原则”（即把长而复杂的成分放在句末的原则）的。例如：
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The discovery has made possible new techniques for brain surgery. 这个发明使脑外科采用新的技术方法成为可能。
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The old lady had stolen her purse which contained a good sum. (比较 = She had her purse stolen.) 老妇人被人偷走了装有大笔钱的钱包。
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They pronounced guilty every one of the accused. (CGEL) 他们宣布每一个被告都有罪。
(参见 object complement )