今日语法：
a quantity of+名词后的谓语单复数情况
a quantity of 后既可以接复数名词，亦可接不可数名词。
a quantity of 加不可数名词，谓语用单数形式；
a quantity of 加复数名词， 谓语用复数形式。
注： quantities of 后加复数名词、不可数名词，谓语都用复数形式。
例：There is a small quantity of water left in the bottle.
A large quantity of books are on sale now.
Great quantities of fish were caught that day.
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