1. The rise of oil prices made scientists ___________ for new energy sources to replace oil.
(A) sustain
(B) separate
(C) search
(D) share
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統計: A(34), B(35), C(387), D(16), E(0) #1406297
統計: A(34), B(35), C(387), D(16), E(0) #1406297
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#2139430
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