Yesterday, the system __________ (crash) due to a power outage. ...

[ Past Tenses ]

Yesterday, the system __________ (crash) due to a power outage.

A. crashed

B. was crashing

C. had crashed

D. had been crashing

Select your answer:

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A. a) the day after tomorrow, next December, and in an hour.

B. b) last winter, a couple of weeks ago, and last night.

C. c) sometimes, at night, and every year.

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