E- mail is very popular today. People seldom write letters now, _________?
#69661
A
did they
B
do they
C
didn’t they
D
don’t they
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It’s very kind__________you to help me with my English．一Not at a11．I think it is important____________us to help each other．
#70597
A
of，of
B
for，of
C
of，for
D
for，for
They have to set out for the last train at once, ________?
#68550
A
don’t they
B
do they
C
haven’t they
D
have they