Workers who cannot speak good English may be at disadvantage with foreign customers. A. w

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(答案→)A. when interacting
B. when interacted
C. when to interact
D. when being interacted
解析：考查状语从句的省略式：句意：英语说得不好的工人在和外国顾客互动的时候，可能有劣势，是省略句，完整的句子是：Workers who cannot speak good English may be at disadvantage they are interacting  with foreign customers. 当主从句的主语一致的时候，可以省略主语和be动词，选A。