—Where did you last night?
—I went to the supermarket．
A：go
B：went
C：do
Unlike his brother, he has a good sense of ____(幽默).
A、熟石灰 B、石墨 C、铜 D、烧碱
若x2+x+m=（x﹣3）（x+n）对x恒成立，则n=____
