A. The company has been, B. experiencing a lot of, C. problems since, D. the last two years
A.the last two years
B.problems since✓ Correct
C.The company has been
D.experiencing a lot of
Explanation
When referring to a specific duration like 'the last two years', the correct preposition is 'for', not 'since'. 'Since' is used with a point in time, while 'for' is used with a period of time.
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