14. John didn't install an alarm, so the thieves broke into his house last night. A. Had he installed an alarm, the thieves wouldn't have broken into his house last night. B. If he installed an alarm, the thieves didn't break into his house last night. C. If he had installed an alarm, the thieves wouldn't break into his house last night. D. Because he hadn't installed an alarm, the thieves would break into his house last night.
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