Construction is expanding all over China, no doubt many materials will be needed at a very big amount in future.

A．China, no doubt many materials will be needed for a very big amount

B．China, no doubt many materials will be needed in a very big amount

C．China; no doubt many materials will be needed in large amounts

D．China; no doubt many materials will be needed for large amounts

哪一项技术是排球攻击性最强的基本技术，是最积极、最有效的进攻武器和得分手段（）。

A.发球

B.垫球

C.传球

D.扣球