A number of their products ________ put on exhibition.
A: has been
B: is
C: have been
D: are
A: has been
B: is
C: have been
D: are
举一反三
- This is one of the best products that____sold this year. A: had been B: have C: have been D: has
- Have you ever _____ to the exhibition which _____ for three weeks? A: gone; has been shown B: been; has been on show C: visited; shown D: went; has lasted
- The meeting______ in October, put the plan has been put off again and again. A: was to have been held B: ought to have held C: was to be held D: must have been held
- The project requires more labor than____because it is extremely difficult. A: have been put in B: to be put in C: has been put in D: being put in
- A huge number of trees __________ in this area. A: has been planted B: have been planted