．You can't see the now for they are having a meeting at the moment．A. editor-in-chiefsB. b

问题补充：

．You can see the now for they are having a meeting at the moment．

A. editor-in-chiefs

B. by an hour

C. by hour

D. each hour

答案：

A. editor-in-chiefs

B. by an hour

(答案→)C. by hour

D. each hour

解析：复合名词的复数形式．s要加在中心词上，因此C为正确答案。