We are confident that the environment ________ by our further efforts to reduce pollution.
#100189
A
improves
B
will be improved
C
has improved
D
was improved
推荐题目
By the 1920s, Howard Carter ____ an explorer.
#99036
A
has become
B
had become
C
became
D
would become
---What is the terrible noise ?  ----The neighbours________their kitchen. 
#102412
A
have repaired
B
are repairing
C
repaired
D
will repair