The frame needs to be strong enough to support the engine.A bottom B structure C

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问题 The frame needs to be strong enough to support the engine.

选项 A bottom
B structure
C surface
D top

答案B

解析frame常见意思是“框,框架”,此处意为“构架,骨架”,与structure同义。bottom “底部”,surface “表面”,top “顶部”,均不符合。
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