【題目】Nothing can stop the Sandstorm ___________ more and more trees are planted．

A．unless B．if C．when D．while

【答案】A

【解析】

試題分析：句意：除非種越來越多的樹，沒有什么能阻止沙塵暴。A．unless除非；B．if如果；C．when當……的時候；D．while在……期間。據(jù)Nothing can stop the Sandstorm故選A。

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