单选题
ProfessorJohnsonissaid_____somesignificantadvanceinhisresearchinthepastyears.
题目答案
C
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ProfessorJohnsonissaid_____somesignificantadvanceinhisresearchinthepastyears.
Thethreementriedmanytimestosneakacrosstheborderintotheneighboringcountry_____bythepoliceeachtime.
_____enoughtimeandmoney,theresearcherswouldhavebeenabletodiscovermoreinthisfield.
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_____,hecannowonlywatchitonTVathome.
_____nocauseforalarm,theoldmanwentbacktohisroom.