21. _____ the vastness of their technology, the aliens perished because they failed to notice a defect in their plans.
(A) In addition
(B) Therefore
(C) While
(D) Since
(E) Despite
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統計: A(3), B(3), C(5), D(1), E(36) #939672
統計: A(3), B(3), C(5), D(1), E(36) #939672