The library needs ,but it’ll have to wait until Sunday.
A. cleaning
B. be cleaned
C. clean
D. being cleaned
网友回答
(答案→)A. cleaning
B. be cleaned
C. clean
D. being cleaned
解析：在“be worth”结构中，只能用动名词的主动形式表被动意义。在be worthy后可不定式的被动式或of+动名词的被动式。动词want,need和require表示“需要”时，可用动名词的主动形式表示被动意义，也可用不定式的被动形式。