毛 * * 思想形成比较完整的理论体系是在                        (    )

A．大革命和土地革命时期

B．抗日战争时期

C．解放战争时期

D．社会主义改造时期

The villagers have already known _____ we'll do is to rebuild the bridge. [ ]

A. this

B. that

C. what

D. which