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Scientists say it may be ten years ______ this medicine was put to use.
Scientists say it may be ten years ______ this medicine was put to use.
admin
2009-08-21
118
问题
Scientists say it may be ten years ______ this medicine was put to use.
选项
A、since
B、before
C、after
D、when
答案
A
解析
本题为连接词辨析题。since意为“自……时候”;after意为“到……时之后”;be fore意为“在……时之前”;when意为“当……时”。本句大意为:科学家们说这种药自从投入使用以来,至今可能有十年了。
转载请注明原文地址:https://kaotiyun.com/show/5fSC777K
本试题收录于:
英语题库成考专升本分类
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成考专升本
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