问题
选择题
---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
答案：D
题目分析：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。