单选题 10.I went there in 1984, and that was the only occasion when I______the journey in exactly two days.

A、 must make
B、 must have made
C、 was able to make
D、 could make

【正确答案】 C

【答案解析】be able to do sth表示其主语具备完成补充成分里所提到的行为的能力，即指能(会)做某事。如：The troupe was able to get a grant for the project from a large corporation．军队可以从一个大公司里获得这个项目的赞助。