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
If you keep_____,you can sit on _____side of the boat.
#4670
A
quite,either
B
still,either
C
calm,each
D
silent,both
Her genuine love for you may _______ what she has sacrificed (牺牲)to make you succeed.
#4730
A
stand for
B
count for
C
account for
D
speak for
Some people who don’t like to talk much are not necessarily shy；they ______ just be quiet people.
#4938
A
must
B
may
C
should
D
would