分类是学习化学的常用方法，下列物质的归类完全正确的是          ( )

A．碱：熟石灰、烧碱、纯碱

B．氧化物：S0₂、KCl0₃、H₂O

C．合金：生铁、不锈钢、黄铜

D．化石燃料：石油、煤、木材

—Sorry, Jim isn't in right now.

—Can you tell him to ring me up if you ______ him? [ ]

A. see

B. will see

C. saw

D. are seeing