问题补充:
---How long did it you to work out the difficult maths problems?
---I about half an hour on it .
A. take ; took
B. spend ; took
C. spend ; cost
D. take ; spent
答案:
A. take ; took
B. spend ; took
C. spend ; cost
(答案→)D. take ; spent
解析:句意:——你需要花费多长时间解决那些数学难题?——我花了大约半个小时。It took sb. to do sth;做某事花费某人多长时间。sb. spent sometime on sth./in doing sth. 某事/做某事花费某人多长时间。;sth. cost sb. some money. 某物花了某人多少钱。故选D。