“thanks” is polite when someone has done you a favour but saying it too often is quite an

问题补充：

“thanks” is polite when someone has done you a favour, but saying it too often is quite another thing.

A. Though saying

B. If saying

C. Saying

D. In spite of saying

答案：

A. Though saying

B. If saying

(答案→)C. Saying

D. In spite of saying

解析：句意：当别人帮你忙的时候，说“谢谢”是礼貌的，但是说的太频繁又是另外一件事。这里第一个is是谓语，前面的是主语，用动名词做主语，所以选C。