The frame needs to be strong enough to support the engine.A:bottomB:surfaceC:topD:structure
The frame needs to be strong enough to support the engine.
A:bottom
B:surface
C:top
D:structure
B:surface
C:top
D:structure
参考解析
解析：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。
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