This kind of exercise is most _______, and therefore is a good test of your students’ ability.
A．surprisingB．encouragingC．excitingD．challenging
A
考查形容詞的用法：A. surprising驚人的，B. encouraging令人鼓勵的C. exciting令人興奮的 D. challenging有挑戰(zhàn)的，句意是：這種練習是最有挑戰(zhàn)的，因此是檢測學生能力的很好的辦法。選A。
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