阿摩線上測驗
8. Birders all over the region _________ to locations where they could observe this unusual avian spectacle.
(A) protracted
(B) ensured
(C) flocked
(D) crushed
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統計： A(0), B(1), C(0), D(0), E(0) #3354310
統計： A(0), B(1), C(0), D(0), E(0) #3354310
