問題詳情

72. Before comet Shoemaker-Levy-9 hit Jupiter, scientists
(A) had been unaware of its existence.
(B) had been tracking it for a few months.
(C) had observed its breakup into twenty-odd fragments.
(D) had known it would not collide with the planet.

參考答案

答案:B
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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