wulingbo
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Lots of healthy food或 A set of keys 作主语时, be动词用单三is/was/has been等.
因为food为不可数名词, A set of keys 的谓动与set一致.
如: Lots of healthy food was offered to the children in poor areas by a company .
There is a set of keys on the table .
1年前
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