咳咳,几个英语句子,piles of rubbish have polluted the air.(why it use
咳咳,几个英语句子,
piles of rubbish have polluted the air.(why it use "have")
A row of willows is lined on one side of the river (why "is")
Masses of work are to be done to welcome the new year.(why"are")
A packet of letters needs mailing.(needs)
全是关于谓动单复数的提问