The frame needs to be strong enough to support the engine.
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B: surface
C: top
D: structure
参考答案:D
题干意为“这个框架要足够结实以便支撑引擎。”句中划线词为名词,意为“框架,结构”。D项structure意为“构造,结构”,例句:Doctors study the structure of the human body.医生们研究人体构造。A项意为“底部”,B项意为“表面”,C项意为“顶部,顶端”,故选D项。
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