It was decades ago ________ I was in my teens ________ the Chinese government decided to reform the social economic system.

A. when; when           B. that; which          C. when; that       D. before; that

It was decades ago ______ I was in my teens ______the Chinese government decided to reform the social system.

    A. that: which       B. when; that           C. which: that          D. that; when

It was decades ago ________ I was in my teens ________ the Chinese government decided to reform the social economic system.

1. A.
   when; when
2. B.
   that; which
3. C.
   when; that
4. D.
   before; that

 It was decades ago ______ I was in my teens ______the Chinese government decided to reform the social system.

    A. that: which       B. when; that           C. which: that          D. that; when