下列各种说法中正确的是……（ ）

A．凡没有单质参加的化合反应一定是非氧化还原反应

B．有单质参加的反应一定是氧化还原反应

C．凡有盐参加的反应都是复分解反应

D．置换反应一定是氧化还原反应

—Excuse me, you're in the way. 

—I'm sorry I can't hear you clearly. Would you please pardon?

—______.[ ]

A. That's all right.

B. OK. I'll say it once more.

C. I'm sorry. Please go ahead.

D. Excuse me, you're in the way.