Answer:
a storm came
Step-by-step explanation:
"a storm may come" would mean that something is going to happen but hasn't happened yet
"a storm will have come" doesn't sound grammatically correct and doesn't suggest that the storm has already happened
A storm might have come
I took the test and this is the correct answer.
Also, I believe as it is asking the possibility of a storm in the past is "might".
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