试题题干
WORD FORMATION
Complete each of the following sentences with the proper form of the word in brackets.
（addition）They appeared to be checking only if there were any
persons in it.
参考答案
试题解析
本题考查常见名词的形容词形式。
空缺处前为any“任何”，后为名词persons，故空缺处应填形容词修饰名词，addition是名词意为“增加、添加”，其形容词形式是additional意为“额外的”，符合题意。
句意：他们似乎只是在检查是否有其他人在里面。