每日一练：职称英语C级每日一练(2015-4-23)
【单选题】
The frame needs to be strong enough to support the engine.
A. structure
B. bottom
C. surface
D. top
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每日一练：职称英语C级每日一练(2015-4-23)
【单选题】
The frame needs to be strong enough to support the engine.
A. structure
B. bottom
C. surface
D. top
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