應(yīng)該用are,后面接的名詞復(fù)數(shù)用are,如果接不可數(shù)名詞則用單數(shù).
如果是quantities of.動詞一定用復(fù)數(shù).
a quantity of water pipes is/ are?
a quantity of water pipes is/ are?
英語人氣：889 ℃時間：2020-06-08 08:49:43
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