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Whathaspuzzledthescientistsisthataslightchangeinitsenvi...

練習題3.01W

問題詳情:

Whathaspuzzledthescientistsisthataslightchangeinitsenvi...

What has puzzled the scientists is that a slight change in its environment ______ have pushed the rare species over the edge into extinction.

       A. would                      B. must                        C. shall                         D. should

【回答】

D

知識點:情態動詞

題型:選擇題

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