Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
The unexpected failure really made all of us （ ）. (frustrate)
【正确答案】：FRUSTRATED
【题目解析】：
本题考查的是常见动词的形容词。
由made(此处为系动词)可知，空缺处应填形容词，frustrate的形容词形式是frustrated意为“感到沮丧的”，frustrating“令人沮丧的”用于描述事物。
句意：意外的失败使我们都感到很沮丧。