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        1. 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(shí);C自從;D在……之前。根據(jù)前后句時(shí)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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