问题描述：
英语单项选择求解析!
_________there,the southwest desert contains a remarkable variety of plants．[ ] A．Rarelyas it rains B．Sometimes it rains C．It rarely rains D．Although rarely rains 求详细解析.为什么选A不选C
_________there,the southwest desert contains a remarkable variety of plants．[ ] A．Rarelyas it rains B．Sometimes it rains C．It rarely rains D．Although rarely rains 求详细解析.为什么选A不选C
问题解答：
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