"I want to go to Mars （火星），because it's a place that no one______to before，"said Carson．（ ）
A．has goneB．has beenC．wasD．went
"I want to go to Mars （火星），because it's a place that no one______to before，"said Carson．（ ）
A．has goneB．has beenC．wasD．went
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