Select the most appropriate option to fill in the blank and make a grammatically correct sentence. Our neighbours threatened to call the police if we ________ stop the noise. |
didn’t hasn’t don’t haven’t |
didn’t |
The most appropriate option to fill in the blank is didn't. The sentence is in the past tense, and the verb "stop" needs a past tense form. The past tense form of "stop" is "stopped." The negative form of "stop" is "didn't stop." The other options are not as appropriate.
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