阿摩線上測驗
21. In the past decade methane levels have shot up, to the extend that atmosphere contains two-and-a-half times as much of the gas as it did before the Industrial Revolution.
(A)have shot up
(B)to the extend
(C)contains
(D)did
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統計： A(50), B(130), C(48), D(24), E(0) #1821511
統計： A(50), B(130), C(48), D(24), E(0) #1821511