Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
A．sinceB．a(chǎn)fterC．beforeD．when
C
考查連詞。Since自從，after后來，before在什么之前，才，就，      when當(dāng)什么時(shí)候，句意：科學(xué)家們說可能五年或六年之后才有可能在人類病人上檢測這種藥物。根據(jù)語境選C。
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