简答题：We cannot help asking if sandstorm is a pure natural phenome

题目内容：
We cannot help asking if sandstorm is a pure natural phenomenon over which we have no control.
A)我们禁不住要问沙尘暴是否是一种纯自然现象，而我们对它无法控制。
B)如果沙尘暴是一种纯自然现象，我们不禁要问这个问题是否不能解决。　　
C)我们不禁要问沙尘暴是否是一种人类无法控制的纯粹的自然现象。
D)如果沙尘暴是一种纯自然现象，对于我们能否控制它我们也不知道。
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