問題詳情
13. Recent studies have shown that abrupt climaticchanges occur more frequently _____.
(A)than scientists anticipated
(B)than are anticipated by scientists
(C)than do scientists anticipate
(D)than scientists will anticipate
參考答案
答案：A
難度：簡單0.772727
統計：A(51),B(5),C(4),D(2),E(0)
用户評論
【mhuang112】評論
recent studieds have shown（現在完成），而科學家的預期（anticipate）發生在這之前，用（過去式）呈現時間前後順序