Discussion

Although Jim worked hard on the project, the loss of the potentially lucrative Cuban market caused him to lose interest. 

(A)NO CHANGE
(B)...
(C)...
(D)...
(E)...
(F)...
*This question is included in Nova Grammar V: Faulty Verb Tense, question #5

The solution is

Posted: 08/17/2012 15:33
This is kinda hard to understand. Would you mind explaining more?
Posted: 08/17/2012 17:33
Johnny, from the explanation (accessible by tapping "Show Correct Answers" after you confirm your choice):

The sentence implies that Jim’s hard work ended before another event in the past—loss of the Cuban market. Hence, Jim’s hard work should be expressed in past perfect tense: Although Jim had worked hard. . . . The answer is (A).

Stated in a different way:
"the loss of ... Cuban market" happened in the past, but Jim's hard work was prior to this event. Hence, the better verb form would be "had worked" instead of "worked".

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