Some scientists think there are _______ 2,000 million flashes of lightning per year.
#26291
A
in short
B
on average
C
as usual
D
in total
推荐题目
I don’t think I’ll need any money but I’ll bring some _____ .
#26611
A
at last
B
in case
C
once again
D
in time
The class __________ 80 students is hard to manage.
#27139
A
consisting of
B
consists of
C
making up of
D
made up
In those days, we had no phones, so we have to keep in touch _________ writing often.
#28930
A
with
B
of
C
on
D
by
