接触噪声导致的听力损伤早期表现为（）

A.高频听力损失

B.语频听力损失

C.听觉适应

D.听觉疲劳

E.听觉效应

It was only when I reread his poem recently _____ to appreciate its beauty.

A．that I began

B．did I begin

C．I began

D．until I began