将抛物线y=3x2向左平移1个单位,再向上平移4个单位后,得到的抛物线解析式是( )。
下列方程中有实数根的是( )
A.x2-3x+4=0
B.x2+2x+3=0
C.x2+x+1=0
D.x2+x-1=0
—Is he coming?
—I'm not sure.He may be late or,____, he may not come at all.
A.at present
B.at least
C.worse still
D.for a while