下列控制噪声的方法分别属于哪一种？A 摩托车上的消声器______； B“掩耳盗铃”______；C在城市中植树造林______．

---Where_____ you _____  these days? I haven’t seen you long.

---To Britain. I left for London two months ago and returned last week .

A．do, go

B．will, go

C．have, gone

D．have, been