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Ateamofscientists

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問題詳情：

Ateamofscientists

A team of scientists _____ the effects of acid rain over the last twenty﹣year period．（　　）

A．studied  B．had studied

C．is studying   D．has been studying

【回答】

D

知識點：動詞時態與語態

題型：選擇題

Tags：Ateamofscientists
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