HI !!
Of course I forgot my umbrella on the one day when it was supposed to rain.
When it was supposed to rain is the relative clause. When is a relative pronoun and it helps to make it clear which time we're talking about.
Hope this helps ☺☺☺
Answer: when it's supposed to rain
Step-by-step explanation:
(when) is a relative clause ,so we choose the answer with a relative clause at the beginning of the sentence.
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