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The country life he was used to______greatly since the opening policy.

   A. changed   B. has changed   C. changing   D. having changed

The country life he was used to______greatly since the opening policy.

   A. changed   B. has changed   C. changing   D. having changed

The country life he was used to _____ greatly since the opening policy.

A. change      B. has changed   C . changing      D. having changed

15. The country life he was used to _____ greatly since the opening policy.

A. change              B. has changed

C. changing            D. having changed

The country life he was used to _____ greatly since the opening policy.

A. change              B. has changed  C. changing            D. having changed