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8.-You looked very tired this morning.What did you do yester

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8.-You looked very tired this morning.What did you do yesterday afternoon?
-I did ___ Christmas shopping.
A.a lot of B.a few of C.a number of D.a piece of
想问问这四个词怎么区别,
8.-You looked very tired this morning.What did you do yester
A a lot of =some
b a few 没有 a few of 的词组
C a number of 相当于 many,修饰可数名词复数
D a piece of 一片 一张