1、B
前一空是经常发生的事 用一般现在时
后一空由these days可以看出是最近正在进行的动作 用现在进行时
2、B
现在完成时表示从过去持续到现在（还要继续进行下去)的动作 表示动作发生在谓语动词之前
过去完成时表示从过去的过去持续到过去的一段时间 表示现在动作已经完成
came to a stop the night before.可以知道现在动作已经完成
1.It seldom （ ）here but it （ ） heavily these days A.snows；sn
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