The fact that so many people still smoke in public places ________ that we may need a nationwide

campaign to raise awareness of the risks of smoking.[ ]

A. suggest  

B. suggests

C. suggested  

D. suggesting

f(x)=x⁴+x³-3x²-4x-1和g(x)＝x³+x²-x-1的最大公因式是( )．

A．(x+1

B．(x-1

C．((x+1)(x-1)

D．((x+1) ² (x-1)

E．(A、B、C、D都不正确