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The correct answer is B
The issues are very complex (A)/ and the problem is that they are bound to be obscured (B)/ by these hypocritical politicians (C)/ No Error (D)
When he looked back, (A)/the professor understood that (B)/he spent most of his life to teach (C)/at the middle school (D).
The Ambassadors and High Commissioners are here in a two-day visit to the state to take stock of preparations for the flag down ceremony.