题目内容
-The frightening black clouds are gathering .lt______.
-Sure Let's go indoors,
| A． is to rain | B． rains | C． is going to rain | D． is raining |
C
解析试题分析：句意：上文，可怕的乌云正在聚集。马上要下雨了。下文，是的，让我们去室内吧。表示将要做某事，故用一般将来时，is going to rain指客观迹象表明将要发生某事，选C。
考点：考查时态
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