单选题 The two companies are working in ______ with each other in the development of new products.
【正确答案】 D
【答案解析】词汇辨析与搭配。 in collaboration with为固定搭配,意为 "合作,协作";installment "安装,分期付款";proportion "比例,部分";correspondence "通信,一致"。