■《薄冰英語語法》第16.8節(jié)認為：從屬連詞whether…or…結構亦可意謂no matter whether…or…，引導讓步狀語從句。關于no matter whether 后面連用 or 的例句如：　　

No matter whether he’s right or wrong, ... ——摘自夸克氏《英語語法大全》第15.41節(jié)　　

no matter whether you win or lose ——摘自《朗文當代高級英語詞典》win詞條　　

■對于下面一題，從句意上看，應選B和D；但最佳答案是 B，因為 on condition that 引導的條件從句通常要位于主句之后，而不位于主句之前。　　

I'm sorry you have decided not to go with us on the river trip, but ____ you change your mind, there will still be enough room on the boat for you.

A. even          B. provided that  C. nevertheless   D. on condition that