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(16), B(11), C(14), D(10), E(0) #3787151

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#7360445
答案是 (A) insurmounta...
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