[ ] he came to study in theu Uiversity,he made much progress in the studof English a while b when c after d since

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[]hecametostudyintheuUiversity,hemademuchprogressinthestudofEnglishawhilebwhencafterdsince[]hecameto

[ ] he came to study in theu Uiversity,he made much progress in the studof English a while b when c after d since
[ ] he came to study in theu Uiversity,he made much progress in the stud
of English a while b when c after d since

[ ] he came to study in theu Uiversity,he made much progress in the studof English a while b when c after d since
[B ] he came to study in the university,he made much progress in the study of English.
a while b when c after d since

D

when 主句是过去式