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

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题目内容（山西财经大学英语3）

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

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