All the clothes donated by the citizens need cleaning thoroughly before being sent to the earth-stricken area, ?
A. needn’t they
B. don’t they
C. didn’t they
D. shouldn’t they
网友回答
A. needn’t they
(答案→)B. don’t they
C. didn’t they
D. shouldn’t they
解析：带有定语从句，宾语从句的主从复合句，疑问部分谓语根据主句的谓语而定。这里谓语是need需要，实意动词，一般现在时，主语为复数，故选B。