---How long did it _____ you to work out the difficult maths problems?
---I ______ about half an hour on it .
A．take ; tookB．spend ; tookC．spend ; costD．take ; spent
D

試題分析：句意：——你需要花費多長時間解決那些數(shù)學難題？——我花了大約半個小時。It took sb. to do sth；做某事花費某人多長時間。sb. spent sometime on sth./in doing sth. 某事/做某事花費某人多長時間。；sth. cost sb. some money. 某物花了某人多少錢。故選D。
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