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

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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 状语从句题。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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