I believe engaging in paid work is acceptable ______ the conditions are safe, th

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问题 I believe engaging in paid work is acceptable ______ the conditions are safe, the hours are reasonable and the wages are fair.

选项 A、after
B、if
C、at that
D、if only

答案 B

解析连词if引导真实条件状语从句，表示“如果”。根据句意，if符合题意。if only较多用于引导非真实条件状语从句表示“但愿，要是……就好了”，要虚拟语气。

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