阿摩線上測驗
37. Investigators found themselves confronting _____ obstacle when it was set by the very laws of physics.
(A) insurmountable
(B) integument
(C) intelligibility
(D) intercommunal
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統計： A(28), B(18), C(18), D(14), E(0) #3787151
統計： A(28), B(18), C(18), D(14), E(0) #3787151
