I ______ to visit their country before long.
A. have been invited
B. am being invited
C. had been invited
D. shall be invited
查看答案
Theory ______ with practice.
A. must be combining
B. must combine
C. must have been combined
D. must be combined
He said such a thing ______ to happen.
A. ought to be not allowed
B. ought not to be allowing
C. ought not to have allowed
D. ought not to be allowed
She told me that her proposal ______.
A. needed to take into consideration
B. needed to be taken into consideration
C. needed to be taking into consideration
D. needed to have taken into consideration
The school authorities and the teachers ______ over the advantages of the demerit system.
A. were always argued
B. were always arguing
C. had always had argued
D. had always been argued
微信支付 
支付宝支付