问题
单项选择题
All products have to pass strict inspection ( )they go out.
A. after
B. since
C. as
D. before
答案
参考答案：D
解析： 句意为：所有产品出厂前必须要经过严格检查。
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All products have to pass strict inspection ( )they go out.
A. after
B. since
C. as
D. before
参考答案：D
解析： 句意为：所有产品出厂前必须要经过严格检查。