阿摩線上測驗
41. Seldom _____ such an unprecedented convergence of technological innovation and societal transformation.
(A) has there been
(B) there has been
(C) have there been
(D) had there been
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統計： A(40), B(2), C(11), D(9), E(0) #3873137
統計： A(40), B(2), C(11), D(9), E(0) #3873137
