下列有关结算公式描述正确的是（）。

A.当日盈亏=平仓盈亏+持仓盈亏

B.持仓盈亏=历史持仓盈亏+当日开仓持仓盈亏

C.历史持仓盈亏=（当日结算价-开仓当日结算价）×持仓量

D.平仓盈亏=平历史仓盈亏+平当日仓盈亏

I suggested to my father that we ______ to Shanghai for a holiday this summer，but the expression on his face suggested that he ______ to it.

A．go; shouldn’t agree

B．would go; shouldn’t agree

C．go; didn’t agree

D．would go; didn’t agree