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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考博英语

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