21．The professor kept telling us that the future _____ to the well-educated and I kept wondering where I _____ of i t.
A. would belong; heard B. belonged; had heard
C. was belonged; heard D. was belonging; had heard
22．______ when to leave, I could only stay at home, _____ nothing.
A. Knowing not; done B. Not having known; doing
C. Having not known; done D. Not knowing; doing
