As soon as the manager entered his office, he began to ______ the telephone book on his desk.

A．look up

B．look into

C．look upon

D．look through

以下关于拟完工程计划投资的计算，正确的是（）

A.拟完工程量×计划单价

B.拟完工程量×实际单价

C.已完工程量×计划单价

D.已完工程量×实际单价