严禁携带（）等重要业务印章上门收款。
参考答案：业务清讫章
扩句
(1)操场干净。
(2)红旗飘扬。
(3)小鸟叫。
—I never thought Jerry can speak English so fluentlyl.
—Well, actually he_________in the USA for two years.
A．was staying
B．stays
C．stayed
D．has stayed
