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The classroom is big enough for 25 students for normal use         you need more space for special activities.
A.onceB.becauseC.ifD.unless
D
连词辨析。A. 一旦    B. 因为  C. 如果   D.除非。句意:除非你需要更多的空间做特殊的活动,这间教室对于正常使用,容纳25个学生足够大了。选D。
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