问题补充:
The reading room needs , but it’ll have to wait until Saturday or Sunday.
A. to clean
B. being cleaned
C. be cleaned
D. cleaning
答案:
A. to clean
B. being cleaned
C. be cleaned
D. cleaning
解析:考查动名词做宾语:need doing=need to be done需要被…,句意:阅览室需要被打扫干净,但还得等到星期六或星期天。选D。