It used to be thought _____ the Earth was flat.
#16601
A
as
B
when
C
since
D
that
推荐题目
The US/UK war against Iraq and the suffering _____ caused have become a big concern all over the world.
#16553
A
what
B
which
C
it
D
×
Recycling is one way to protect the environment; reusing is _____.
#15129
A
another
B
the other
C
one another
D
one
The old lady is said to have three children，two of ____studying abroad.
#15113
A
whom
B
them
C
all
D
who
I want to buy a comic book but there were __________ left at the bookshop.
#57815
A
no one
B
nothing
C
nobody
D
none