2. 外语
  3. More poles are needed to ______ the weight of the tent.

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

admin2017-04-12  60
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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