She felt _____ when she couldn't figure out how to solve the simple math problem.
Adelightful
Bgrateful
Cconfused正確答案
Drelieved
答案與詳解
confused 意為「困惑的、搞不清楚的」。連簡單數學題都想不通,自然會感到困惑,完全契合 couldn't figure out 的語境。
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