因为后面有yesterday,有时间点.
时间点分为过去的时间,现在的时间,将来的时间,
你要看句子当中是否存在时间点.时态就跟着它变.
如果没有yesterday,那就是填appears.这才表示自然规律.
e.g.I washed my hands before the meal yesterday.
饭前洗手可以说是一个习惯,有了yesterday,就要用过去时；没有,就可以用一般现在时.
【俊狼猎英】
一道初二英语单词填空题.a rainbow (appear) in the sky after the rain yes
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