糖果种类繁多，各种糖果的（）感官要求内容是不同的。
A、组织
B、滋味气味
C、杂质
D、最小单位包装
参考答案：B
By the end of last year, they _______ 2,000 English words.
A． learned
B． have learned
C． had learned
D． learns
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