No one knows exactly when our ancestors started talking，but new evidence suggests _______might have happened a long time ago．
#4852
A
which
B
what
C
it
D
they
推荐题目
Expo 2010 Shanghai China will offer ____ wonderful opportunity for ____ cross - culture dialogues．
#4793
A
a;不填
B
a; the
C
不填;the
D
the;不填
-----Alice looks blue today.-----Yes, I asked her, but she wouldn’t say _____ troubled her.
#59079
A
why was it that
B
that was why
C
it was what
D
what it was that
Our football team’s ____ has been excellent during the whole year.
#4826
A
demand
B
master
C
history
D
performance
People traveling long distances frequently have to decide ______they would prefer to go by land, sea or air.
#59055
A
which
B
how
C
why
D
whether