31. What is the passage mainly about?
(A) Hiring more workers in the Silicon Valley
(B) Why San Francisco Bay Area is one of the most expensive in the world
(C)How the pandemic will affect people’s pay
(D)Working remotely for technology companies
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統計: A(128), B(176), C(208), D(1027), E(0) #2899211
統計: A(128), B(176), C(208), D(1027), E(0) #2899211