17. Yellowstone National Park was the first national park in the U.S. It _______in 1872. 
(A) established
(B) had established
(C) was established
(D) has been established

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統計： A(37), B(72), C(282), D(88), E(0) #2722235

詳解 (共 2 筆)

#4826396
中譯：黃石國家公園是美國第一座國家公園，...
(共 73 字，隱藏中）
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#5464236
過去簡單式：was/were +vpp
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