专四
A．permit
B．permitting
C．permitted
D．permits
【解析】独立主格结构。此句中使用的是“主语+动词-ing形式”的独立主格结构，作条件状语，相当于If time permits．因此应选B。由于time和permit不构成被动或完成关系，因此不选C。A和D为谓语动词，无法构成独立结构．因此不能选。
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