13. On construction sites, workers should________________the rules and wear helmets at all times for their own safety.
(A) avoid
(B) transfer
(C) observe
(D) influence

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統計: A(7), B(7), C(25), D(4), E(0) #1216162

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#2173853
 observe  遵守
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#3633104
13. On construction ...
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