The incomes of skilled workers went up. unskilled workers saw their earnings fall.A. More

问题补充：

The incomes of skilled workers went up. ，unskilled workers saw their earnings fall.

A. Moreover

B. Therefore

C. Meanwhile

D. Otherwise

答案：

A. Moreover

B. Therefore

(答案→)C. Meanwhile

D. Otherwise

解析：A. Moreover还有，B. Therefore 因此，C. Meanwhile同时，然而，D. Otherwise否则，句意：技术工人的收入在增加，然而，没有技术的工人收入在下降。选C。