.Among all the problems,_______is so difficult as this one.
#15803
A
not one
B
either
C
neither
D
none
推荐题目
．No one knows exactly when our ancestors started talking，but new evidence suggests _______might have happened a long time ago．
#16908
A
which
B
what
C
it
D
they
—Would you like______ to eat ?—Yes，please.
#57390
A
anything different
B
different anything
C
something different
D
different something
— Mum, can I have to eat? I’m hungry.—You can get some in the fridge.
#57481
A
something delicious
B
anything delicious
C
delicious something
D
delicious anything
When you go outing with your sisters, you must see to ________ that they are safe.
#15532
A
everything
B
it
C
them
D
yourself