Question

— What do you think of the young lady?
— She is hard-working. She ________ all her effort into her work before she got ill.

A．has put

B．put

C．had put

D．would put

Answer 1

C

解析试题分析：句意：你认为那个年轻的女士怎么样？她很勤奋。她把所有的精力都放在了工作上直到病倒。she got ill为一般过去时，在这之前的动作应为“过去的过去”，即用过去完成时；故选C。
考点：考查动词的时态。