11. It was _____ I reached there _____ I began to know something about the matter.
A. until, when B. until, that
C. not until, that D. not when, that
12. It was _____ my father worked _____ I work now.
A. where, that B. where, when
C. that, where D. that, that
13. It was not until he came back ______ he knew the police were looking for him.
A. which B. since
C. that D. before
14. It’s more than half a century ______ the People’s Republic of China was liberated.
A. when B. that
C. since D. after
15. It was not ______ you had explained how ______ I managed to do it.
A. for, that B. until, that
C. for, when D. until, when
【参考答案】(from www.hxen.com)