A:what was it that
B:what it was that
C:what was it which
D:what did
Amy is ____ English girl.
x
﹣2
﹣1
0
1
2
3
y
6
4
﹣4
那么方程ax+b=0的解是____,不等式ax+b>0的解是____.
一个三位数减去99,差最小是____ 。