Tom had been studying French hard for nearly three years    he mastered it．
A．a(chǎn)fterB．when C．since D．before
D

試題分析:句意：——湯姆努力學(xué)了將近三年后才精通了法語。A在……之后；B當(dāng)……時；C自從；D在……之前。根據(jù)前后句時態(tài)可知“學(xué)習(xí)法語”發(fā)生在“掌握法語”之前，所以用before，答案選D。
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