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问题详情

All of our equipment dates back to the 1960s and 1970s; we cannot make products that compete with foreign products, __________we can buy the necessary technology

A、unless

B、while

C、Once

D、if

时间：2021-09-06 20:03 关键词：麦能网山西财经大学英语3

答案解析

A

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