Various efforts________in the past decades to protect the environment．（　　）

A．had made	B．have made
C．were made	D．have been made

【答案】D

【解答】

【點(diǎn)評】

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發(fā)布：2024/10/25 9:30:2組卷：225引用：7難度：0.9

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A．a(chǎn)re displayed	B．will be displayed
C．have been displayed	D．were displayed

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C．have been reported	D．had been reported

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