Scientists say it will be five or six years __________ it is possible to test this medicine on humans.
A．a(chǎn)fterB．beforeC．sinceD．when
B
    
試題分析:句意：科學(xué)家說還需要六年的時(shí)間才有可能在人身上實(shí)驗(yàn)這種藥物。A在……之后；B在……之前；C自從；D當(dāng)……時(shí)候。固定句型：it will be +時(shí)間段+before從句“還要多久才”。答案選B。
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