Scientists don’t think that a warm winter always has a negative influence on our life,____?
#64541
A
don’t they
B
do they
C
hasn’t it
D
has it
推荐题目
-___________ do you go to Old People’s Home?-Twice a month. 
#59921
A
How long
B
How soon
C
How often
D
How many times
—Does she ______ a knife? —No, she _________. 
#60349
A
has; don’t
B
have; does
C
have; doesn’t
D
have; has