咳咳,几个英语句子,piles of rubbish have polluted the air.(why it use
4个回答
1.piles是复数
2.a row是单数
3.again:masses是复数
4.a packet是单数
注意:这类句子谓语的单复数要看中心词,记住这个规则,以后就不会错了.
也祝你考试好运!
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