13. With a digital device in his hand, the millionaire demonstrates _____.
(A) his newest invention how to work
(B) how his newest invention which to work
(C) how his newest invention works
(D) to his newest invention works
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統計: A(194), B(128), C(764), D(152), E(0) #2797849
統計: A(194), B(128), C(764), D(152), E(0) #2797849