1. I _______ for a very long time, so I _______ very angry with them.
A. had been waiting - was
B. have been waiting - was
C. have waited - was
D. have been waiting – am
2. I'm sad to think that all my plants _____ by the time I _______ from holiday. A. will die - return
B. died - returned
C. may have died - have returned
D. had died - could return
3.Though world food production ________ since 1950 people still ________ from shortages in various parts of the world.
A. has been doubing - may be suffering
B. has doubled - suffer
C. had been doubled - could be suffering
D. has been doubled – suffers
4. For several years now she _______ as private secrectary to the bank manager.
A. worked
B. has been working
C. was working
D. works
5. In the past 50 years, that country _______ through 15 consitutions, I8 coups and 21 prime ministers.
A. has been going
B. goes
C. were going
D. has gone
6. She was still working a eight o'clock yesterday evening.
She _______ since six o'clock in the morning.
A. has worked
B. has been working
C. worked
D. had been working
Giải thích giúp luôn ạ
1. I _______ for a very long time, so I _______ very angry with them.
A. had been waiting - was
B. have been waiting - was
C. have waited - was
D. have been waiting – am
2. I'm sad to think that all my plants _____ by the time I _______ from holiday. A. will die - return
B. died - returned
C. may have died - have returned
D. had died - could return
3.Though world food production ________ since 1950 people still ________ from shortages in various parts of the world.
A. has been doubing - may be suffering
B. has doubled - suffer
C. had been doubled - could be suffering
D. has been doubled – suffers
4. For several years now she _______ as private secrectary to the bank manager.
A. worked
B. has been working
C. was working
D. works
5. In the past 50 years, that country _______ through 15 consitutions, I8 coups and 21 prime ministers.
A. has been going
B. goes
C. were going
D. has gone
6. She was still working a eight o'clock yesterday evening.
She _______ since six o'clock in the morning.
A. has worked
B. has been working
C. worked
D. had been working