适当形式填空.A mass of water_____(be)flowing out of the room.Masses of ice_____(be)floating down the river.A mass of people_____(have)already gathered in the theatre.最好说下理由.

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适当形式填空.A mass of water_____(be)flowing out of the room.Masses of ice_____(be)floating down the river.A mass of people_____(have)already gathered in the theatre.最好说下理由.
适当形式填空.
A mass of water_____(be)flowing out of the room.
Masses of ice_____(be)floating down the river.
A mass of people_____(have)already gathered in the theatre.
最好说下理由.

适当形式填空.A mass of water_____(be)flowing out of the room.Masses of ice_____(be)floating down the river.A mass of people_____(have)already gathered in the theatre.最好说下理由.

准确答案为:

  1. is

  2. is

  3. have


解释:a mass of 和 masses of后面既可以加可数名词,也可以加不可数名词.

此类短语做句子主语时,谓语动词的数跟of后面的名词的数保持一致,即就近原则.


第一二题of后面的water/ice是不可数名词,所以谓语动词都用单数形式is;

而第3题of后面的people是可数名词复数,所以谓语动词用复数形式have.

is
is
have