Fill in the blanks with the appropriate word:
It’s going to start raining. Let’s go home before that.
Let’s go home ________it starts raining.

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after

when

before

while

answer is C.

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Detailed Solution

Option A: After means next in time and it's used when one action happens next to a different. So, this can't be the solution and thus this can be an incorrect option.
Option B: When is employed to speak a couple of specific point in time when something happened or will happen. This can not be employed in the sentence. Thus, this is often the incorrect option.
Option C: Before is opposite of after where one action happens soon after the primary one. this can be the right answer because during this sentence it states that rain is on the point of come and that we must reach home before it starts raining. this can be the right answer.
Option D: While is employed to indicate those actions or events which happen at the identical time within the past, present or future. This can't be utilized in the sentence. Thus, this is often the incorrect option.
Hence, option C is the correct answer.