单选题
Representatives from the two firms are currently ______ the middle of negotiations concerning a possible joint venture.
A. in B. on C. at D. within
A
B
C
D
【正确答案】
A
【答案解析】
[解析] 句子表示“协商正在进行”，因此构成短语in the middle of意为正在做…．
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