13. Recent studies have shown that abrupt climatic changes occur more frequently _____.
(A)than scientists anticipated
(B)than are anticipated by scientists
(C)than do scientists anticipate
(D)than scientists will anticipate

答案：登入後查看
統計： A(175), B(14), C(11), D(6), E(0) #869211

詳解 (共 2 筆)

#1362413
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
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#1295408
請問這題的文法如何解釋？
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