You didn’t come to the party last night, did you?

-No, I _____ my composition at home then.

A．was writing

B．was written

C．wrote

D．have written

影响企业盈亏临界点销售量的因素包括（）。

A.固定成本总额

B.目标利润

C.销售单价

D.单位变动成本

E.销售收入