问题描述：
在ABCD四处中有一处错,请指出并改正,用语法解释原因
The union and the management are having such 【a difficult(A)】 time 【agreeing(B)】 on a contract 【for(C)】 the forthcoming year that the workers 【may go on strike(D)】.
The union and the management are having such 【a difficult(A)】 time 【agreeing(B)】 on a contract 【for(C)】 the forthcoming year that the workers 【may go on strike(D)】.
问题解答：
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