试题题干
Complete each of the following sentences with the proper form of the word in brackets.
(arrive) All foreign visitors are now able to obtain a Cambodian visa upon _______ at the airport.
参考答案
试题解析
此处缺少名词/动名词形式。
upon后接名词或动名词形式均可，常见的用法是upon+n./v-ing，所以可填arrival或arriving。
句意：所有外来游客只要到达机场，就可以得到柬埔寨签证。