氾濫的青春2017.10.26 回答

C

因前後均的句子，必須要選連詞，排除B和D；又因在介詞後不能用that來引導定語從句，所以選C。during which time在那段時間裡。

熱心問友2017.10.26 回答

he stayed there for quite a long time，during_which time____he learned much spoken english。

表強調。