问题描述：
You look 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
为什么选A不选C呢?
shopping
A.a lot of
B.a few of
C.a number of
D.a piece of
为什么选A不选C呢?
问题解答：
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