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That was the ( A. difficult B. more difficult C. most difficult ) test we had for years.

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Jakesmithid
that was the (most difficult) test we had for years.
Reikamayumi02id
That was the most difficult test we had for years. "Letter C. most difficult" is the answer because there is comparison in the sentence. The word difficult must be in superlative form because the subject(that) is compared to a group(years).