．It was a long time before she to what he had said.A. caught onB. went onC. went up D. cau

问题补充：

．It was a long time before she to what he had said.

A. caught on

B. went on

C. went up

D. caught up

答案：

(答案→)A. caught on

B. went on

C. went up

D. caught up

解析：短语辨析。A. 理解；变得流行 B. 继续下去 C. 增长；上升 D.赶上。句意：很长时间她才理解他说了什么。故选A。