单项选择题

We can infer (推断) that the plumbing ______ at that time.

A．cost little
B．was more expensive than a water system
C．was too expensive for every family to afford
D．was not necessary
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单项选择题
—How was your recent visit to Qingdao —It was great. We visited some friends, and spent the ______days at the seaside.
A．few Last sunny
B．last few sunny
C．last sunny few
D．few sunny last
单项选择题
The library needs______, but it'll have to wait until Sunday.
A．cleaning
B．be cleaned
C．clean
D．being cleaned
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