Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
A．sinceB．beforeC．a(chǎn)fterD．when
B
本題是考查連詞的用法。本題的關鍵是理解句子的含義：“科學家說還需要五到十年才有可能將藥物在人體身上進行實驗。”只有B選項符合題意。
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