Question

I lived with my sister this summer and didn’t have to pay rent. So I _____ save most of my salary.

A．could

B．would

C．was able to

D．should

Answer 1

C

本題考查can和be able to的差別。
① can和be able to都可以表示有能力作某事，但be able to的主語(yǔ)必須是人或動(dòng)物，而can 沒(méi)有這個(gè)限制，如：
He can swim. =" He" is able to swim.
The radio can be fixed in 30 minutes.（句中的can不能用be able to）
② 根據(jù)be動(dòng)詞的變化而有各種時(shí)態(tài)的變化，而can只有過(guò)去時(shí)。
③ be able to表示克服困難或通過(guò)努力做成某事，其過(guò)去時(shí)可表示“設(shè)法做成”，相當(dāng)于managed to do或succeeded in doing，而can表示本身具有能力做某事。如：
With the help of the firemen, they were able to leave the burning house.
本題是指通過(guò)節(jié)省房錢來(lái)攢錢，當(dāng)然用be able to更合適，再如：
Although his leg was hurt, he was able to swim to the bank.