More poles are needed to ______ the weight of the tent.

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问题 More poles are needed to ______ the weight of the tent.

选项 A、retain
B、sustain
C、maintain
D、obtain

答案B

解析 sustain vt.支撑:保持,使持续不息:供养,维持(生命)(如:sustain the weight;sustain a conversation:This food will sustain you.)。retain vt.保留,保持。maintain vt.维持,保持;坚持,主张;维修,保养。obtain vt.获得,得到。
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