Emad Ragheb posted:

Although the police suspected him, he was able to prove that he
(was working /had been working) when the crime was committed.

What is the right answer in this sentence? 

Hello, Emad,

Both answers are right. Because of the adverbial "when the crime was committed," the past perfect is not needed to show that the working occurred further back in the past than "was able to prove."

But the past perfect is also correct. The fact that the past perfect isn't necessary doesn't mean you shouldn't use it. And if you think the test makers believe (mistakenly) that the past perfect is needed, it would be prudent to use it.

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