The population in China ______ reduced in recent years.
A: have been
B: is
C: has been
D: are
A: have been
B: is
C: has been
D: are
举一反三
- A recent study has found that the number of smokers______sharply over the past five years. A: is increasing B: are increasing C: has been increasing D: have been increasing
- Thesales for beef have been flat in recent years. A: The sales have been increasing B: The sales have been satisfactory C: The sales have been slow D: The sales haven't been steady
- Scientists think that there _____ life on Earth for millions of years. A: has had B: have had C: has been D: have been
- There has been ______ (稳步提高) in people’s living standard in recent years.
- In recent years, ( ) produced in the process of soil denitrification has been reported to have greenhouse effect. A: NO B: NO2 C: N2O D: N2